diff --git a/app/controllers/audits_controller.rb b/app/controllers/audits_controller.rb
index 50717d2cde..9f40d068e1 100644
--- a/app/controllers/audits_controller.rb
+++ b/app/controllers/audits_controller.rb
@@ -38,8 +38,8 @@ def finalize
 
     increasing_adjustment, decreasing_adjustment = @audit.adjustment.split_difference
     ActiveRecord::Base.transaction do
-      @audit.storage_location.increase_inventory(increasing_adjustment.line_item_hashes)
-      @audit.storage_location.decrease_inventory(decreasing_adjustment.line_item_hashes)
+      @audit.storage_location.increase_inventory(increasing_adjustment.line_item_values)
+      @audit.storage_location.decrease_inventory(decreasing_adjustment.line_item_values)
       AuditEvent.publish(@audit)
     end
     @audit.finalized!
diff --git a/app/models/concerns/itemizable.rb b/app/models/concerns/itemizable.rb
index 2a9db88332..e8aa83a198 100644
--- a/app/models/concerns/itemizable.rb
+++ b/app/models/concerns/itemizable.rb
@@ -102,7 +102,7 @@ def total_quantity
     line_items.total
   end
 
-  def line_item_hashes
+  def line_item_values
     line_items.map do |l|
       item = Item.find(l.item_id)
       { item_id: item.id, name: item.name, quantity: l.quantity, active: item.active }.with_indifferent_access
@@ -111,9 +111,11 @@ def line_item_hashes
 
   # TODO: I'm not sure if this should just be removed or leave as a warning for now?
   def to_a
-    Rails.logger.error("Calling Itemizable#to_a is deprecated. Use Itemizable#line_item_hashes instead.")
-    Rails.logger.error("Called on #{inspect} by #{caller}")
-    line_item_hashes
+    line_item_values unless Flipper.enabled?(:deprecate_to_a)
+
+    Rails.logger.warn "Called #to_a on an Itemizable #{inspect}."
+    Rails.logger.warn caller.join("\n")
+    raise StandardError, "Calling to_a on an Itemizable is deprecated. Use #line_item_values instead."
   end
 
   private
diff --git a/app/services/adjustment_create_service.rb b/app/services/adjustment_create_service.rb
index 67820a2dd8..6e71909c78 100644
--- a/app/services/adjustment_create_service.rb
+++ b/app/services/adjustment_create_service.rb
@@ -25,8 +25,8 @@ def call
         # Split into positive and negative portions.
         # N.B. -- THIS CHANGES THE ORIGINAL LINE ITEMS ON @adjustment DO **NOT** RESAVE AS THAT WILL CHANGE ANY NEGATIVE LINE ITEMS ON THE ADJUSTMENT TO POSITIVES
         increasing_adjustment, decreasing_adjustment = @adjustment.split_difference
-        @adjustment.storage_location.increase_inventory(increasing_adjustment.line_item_hashes)
-        @adjustment.storage_location.decrease_inventory(decreasing_adjustment.line_item_hashes)
+        @adjustment.storage_location.increase_inventory(increasing_adjustment.line_item_values)
+        @adjustment.storage_location.decrease_inventory(decreasing_adjustment.line_item_values)
       rescue InsufficientAllotment => e
         @adjustment.errors.add(:base, e.message)
         raise e
diff --git a/app/services/allocate_kit_inventory_service.rb b/app/services/allocate_kit_inventory_service.rb
index 161a3265fe..f38c4e4c9e 100644
--- a/app/services/allocate_kit_inventory_service.rb
+++ b/app/services/allocate_kit_inventory_service.rb
@@ -78,7 +78,7 @@ def set_error(error)
   end
 
   def kit_content
-    kit.line_item_hashes.map do |item|
+    kit.line_item_values.map do |item|
       item.merge({
                    quantity: item[:quantity] * increase_by
                  })
diff --git a/app/services/deallocate_kit_inventory_service.rb b/app/services/deallocate_kit_inventory_service.rb
index 22378a21b2..e26fb1fbc7 100644
--- a/app/services/deallocate_kit_inventory_service.rb
+++ b/app/services/deallocate_kit_inventory_service.rb
@@ -83,7 +83,7 @@ def set_error(error)
   end
 
   def kit_content
-    kit.line_item_hashes.map do |item|
+    kit.line_item_values.map do |item|
       item.merge({
                    quantity: item[:quantity] * decrease_by
                  })
diff --git a/app/services/distribution_create_service.rb b/app/services/distribution_create_service.rb
index 8a4c72fa31..d98a848a0a 100644
--- a/app/services/distribution_create_service.rb
+++ b/app/services/distribution_create_service.rb
@@ -14,7 +14,7 @@ def call
 
       DistributionEvent.publish(distribution)
 
-      distribution.storage_location.decrease_inventory(distribution.line_item_hashes)
+      distribution.storage_location.decrease_inventory(distribution.line_item_values)
       distribution.reload
       @request&.update!(distribution_id: distribution.id, status: 'fulfilled')
       send_notification if distribution.partner&.send_reminders
diff --git a/app/services/distribution_destroy_service.rb b/app/services/distribution_destroy_service.rb
index db1c8c064d..f788bd4bdb 100644
--- a/app/services/distribution_destroy_service.rb
+++ b/app/services/distribution_destroy_service.rb
@@ -7,7 +7,7 @@ def call
     perform_distribution_service do
       DistributionDestroyEvent.publish(distribution)
       distribution.destroy!
-      distribution.storage_location.increase_inventory(distribution.line_item_hashes)
+      distribution.storage_location.increase_inventory(distribution.line_item_values)
     end
   end
 end
diff --git a/app/services/distribution_update_service.rb b/app/services/distribution_update_service.rb
index b1692c9fa1..5889d2a622 100644
--- a/app/services/distribution_update_service.rb
+++ b/app/services/distribution_update_service.rb
@@ -2,7 +2,7 @@ class DistributionUpdateService < DistributionService
   def initialize(old_distribution, new_distribution_params)
     @distribution = old_distribution
     @params = new_distribution_params
-    @old_line_items = old_distribution.line_item_hashes
+    @old_line_items = old_distribution.line_item_values
   end
 
   def call
@@ -27,7 +27,7 @@ def resend_notification?
   end
 
   def distribution_content
-    @distribution_content ||= DistributionContentChangeService.new(@old_line_items, distribution.line_item_hashes).call
+    @distribution_content ||= DistributionContentChangeService.new(@old_line_items, distribution.line_item_values).call
   end
 
   private
diff --git a/app/services/donation_create_service.rb b/app/services/donation_create_service.rb
index 4ed78aa653..56d470dcf9 100644
--- a/app/services/donation_create_service.rb
+++ b/app/services/donation_create_service.rb
@@ -2,7 +2,7 @@ module DonationCreateService
   class << self
     def call(donation)
       if donation.save
-        donation.storage_location.increase_inventory(donation.line_item_hashes)
+        donation.storage_location.increase_inventory(donation.line_item_values)
         DonationEvent.publish(donation)
       end
     end
diff --git a/app/services/donation_destroy_service.rb b/app/services/donation_destroy_service.rb
index a861e96f8a..57f6092424 100644
--- a/app/services/donation_destroy_service.rb
+++ b/app/services/donation_destroy_service.rb
@@ -10,7 +10,7 @@ def call
     ActiveRecord::Base.transaction do
       organization = Organization.find(organization_id)
       donation = organization.donations.find(donation_id)
-      donation.storage_location.decrease_inventory(donation.line_item_hashes)
+      donation.storage_location.decrease_inventory(donation.line_item_values)
       DonationDestroyEvent.publish(donation)
       donation.destroy!
     end
diff --git a/app/services/itemizable_update_service.rb b/app/services/itemizable_update_service.rb
index f638891c12..7ef851f69f 100644
--- a/app/services/itemizable_update_service.rb
+++ b/app/services/itemizable_update_service.rb
@@ -36,13 +36,13 @@ def self.call(itemizable:, type: :increase, params: {}, event_class: nil)
   # @param to_location [StorageLocation]
   def self.update_storage_location(itemizable:, apply_change_method:, undo_change_method:,
     params:, from_location:, to_location:)
-    from_location.public_send(undo_change_method, itemizable.line_item_hashes)
+    from_location.public_send(undo_change_method, itemizable.line_item_values)
     # Delete the line items -- they'll be replaced later
     itemizable.line_items.delete_all
     # Update the current model with the new parameters
     itemizable.update!(params)
     itemizable.reload
     # Apply the new changes to the storage location inventory
-    to_location.public_send(apply_change_method, itemizable.line_item_hashes)
+    to_location.public_send(apply_change_method, itemizable.line_item_values)
   end
 end
diff --git a/app/services/purchase_create_service.rb b/app/services/purchase_create_service.rb
index b6c3783b08..fdfa2b85d3 100644
--- a/app/services/purchase_create_service.rb
+++ b/app/services/purchase_create_service.rb
@@ -2,7 +2,7 @@ class PurchaseCreateService
   class << self
     def call(purchase)
       if purchase.save
-        purchase.storage_location.increase_inventory(purchase.line_item_hashes)
+        purchase.storage_location.increase_inventory(purchase.line_item_values)
         PurchaseEvent.publish(purchase)
       end
     end
diff --git a/app/services/purchase_destroy_service.rb b/app/services/purchase_destroy_service.rb
index 7d437c68fe..c32ca02921 100644
--- a/app/services/purchase_destroy_service.rb
+++ b/app/services/purchase_destroy_service.rb
@@ -2,7 +2,7 @@ class PurchaseDestroyService
   class << self
     def call(purchase)
       ActiveRecord::Base.transaction do
-        purchase.storage_location.decrease_inventory(purchase.line_item_hashes)
+        purchase.storage_location.decrease_inventory(purchase.line_item_values)
         PurchaseDestroyEvent.publish(purchase)
         purchase.destroy!
       end
diff --git a/app/services/transfer_create_service.rb b/app/services/transfer_create_service.rb
index 31a9cbe331..c4cb5cc12c 100644
--- a/app/services/transfer_create_service.rb
+++ b/app/services/transfer_create_service.rb
@@ -4,8 +4,8 @@ def call(transfer)
       if transfer.valid?
         ActiveRecord::Base.transaction do
           transfer.save
-          transfer.from.decrease_inventory(transfer.line_item_hashes)
-          transfer.to.increase_inventory(transfer.line_item_hashes)
+          transfer.from.decrease_inventory(transfer.line_item_values)
+          transfer.to.increase_inventory(transfer.line_item_values)
           TransferEvent.publish(transfer)
         end
       else
diff --git a/app/services/transfer_destroy_service.rb b/app/services/transfer_destroy_service.rb
index 5992649aa5..42e5ad786a 100644
--- a/app/services/transfer_destroy_service.rb
+++ b/app/services/transfer_destroy_service.rb
@@ -24,7 +24,7 @@ def transfer
   end
 
   def revert_inventory_transfer!
-    transfer.to.decrease_inventory(transfer.line_item_hashes)
-    transfer.from.increase_inventory(transfer.line_item_hashes)
+    transfer.to.decrease_inventory(transfer.line_item_values)
+    transfer.from.increase_inventory(transfer.line_item_values)
   end
 end
diff --git a/spec/factories/donations.rb b/spec/factories/donations.rb
index cb339aa3f3..3a11978fb1 100644
--- a/spec/factories/donations.rb
+++ b/spec/factories/donations.rb
@@ -58,7 +58,7 @@
       end
 
       after(:create) do |instance, evaluator|
-        evaluator.storage_location.increase_inventory(instance.line_item_hashes)
+        evaluator.storage_location.increase_inventory(instance.line_item_values)
       end
     end
   end
diff --git a/spec/factories/purchases.rb b/spec/factories/purchases.rb
index 0ec08f46f0..4ca7ff9272 100644
--- a/spec/factories/purchases.rb
+++ b/spec/factories/purchases.rb
@@ -47,7 +47,7 @@
       end
 
       after(:create) do |instance, evaluator|
-        evaluator.storage_location.increase_inventory(instance.line_item_hashes)
+        evaluator.storage_location.increase_inventory(instance.line_item_values)
       end
     end
   end
diff --git a/spec/factories/transfers.rb b/spec/factories/transfers.rb
index 263ba91c4a..5b71cb46af 100644
--- a/spec/factories/transfers.rb
+++ b/spec/factories/transfers.rb
@@ -39,7 +39,7 @@
       end
 
       after(:create) do |instance, evaluator|
-        evaluator.from.increase_inventory(instance.line_item_hashes)
+        evaluator.from.increase_inventory(instance.line_item_values)
       end
     end
   end
diff --git a/spec/models/storage_location_spec.rb b/spec/models/storage_location_spec.rb
index fda088d404..4d978cc895 100644
--- a/spec/models/storage_location_spec.rb
+++ b/spec/models/storage_location_spec.rb
@@ -72,7 +72,7 @@
 
         it "increases inventory quantities from an itemizable object" do
           expect do
-            subject.increase_inventory(donation.line_item_hashes)
+            subject.increase_inventory(donation.line_item_values)
           end.to change { subject.size }.by(66)
         end
       end
@@ -83,7 +83,7 @@
 
         it "creates those new inventory items in the storage location" do
           expect do
-            subject.increase_inventory(donation_with_new_items.line_item_hashes)
+            subject.increase_inventory(donation_with_new_items.line_item_values)
           end.to change { subject.inventory_items.count }.by(1)
         end
       end
@@ -94,7 +94,7 @@
 
         it "re-activates the item as part of the creation process" do
           expect do
-            subject.increase_inventory(donation_with_inactive_item.line_item_hashes)
+            subject.increase_inventory(donation_with_inactive_item.line_item_values)
           end.to change { subject.inventory_items.count }.by(1)
                                                          .and change { Item.count }.by(1)
         end
@@ -108,7 +108,7 @@
       it "decreases inventory quantities from an itemizable object" do
         storage_location = create(:storage_location, :with_items, item_quantity: 100, item: item, organization: @organization)
         expect do
-          storage_location.decrease_inventory(distribution.line_item_hashes)
+          storage_location.decrease_inventory(distribution.line_item_values)
         end.to change { storage_location.size }.by(-66)
       end
 
@@ -118,7 +118,7 @@
         it "gives informative errors" do
           storage_location = create(:storage_location, :with_items, item_quantity: 10, item: item, organization: @organization)
           expect do
-            storage_location.decrease_inventory(distribution_but_too_much.line_item_hashes).errors
+            storage_location.decrease_inventory(distribution_but_too_much.line_item_values).errors
           end.to raise_error(Errors::InsufficientAllotment)
         end
 
@@ -126,7 +126,7 @@
           storage_location = create(:storage_location, :with_items, item_quantity: 10, item: item, organization: @organization)
           starting_size = storage_location.size
           begin
-            storage_location.decrease_inventory(distribution.line_item_hashes)
+            storage_location.decrease_inventory(distribution.line_item_values)
           rescue Errors::InsufficientAllotment
           end
           storage_location.reload
diff --git a/spec/services/distribution_destroy_service_spec.rb b/spec/services/distribution_destroy_service_spec.rb
index 77ba37322a..79c34a51cb 100644
--- a/spec/services/distribution_destroy_service_spec.rb
+++ b/spec/services/distribution_destroy_service_spec.rb
@@ -43,7 +43,7 @@
         end
         before do
           allow(distribution).to receive(:storage_location).and_return(fake_storage_location)
-          allow(distribution).to receive(:line_item_hashes).and_return(fake_items)
+          allow(distribution).to receive(:line_item_values).and_return(fake_items)
           allow(fake_storage_location).to receive(:increase_inventory)
         end
 
@@ -106,7 +106,7 @@
 
         before do
           allow(distribution).to receive(:storage_location).and_return(fake_storage_location)
-          allow(distribution).to receive(:line_item_hashes).and_return(fake_insufficient_items)
+          allow(distribution).to receive(:line_item_values).and_return(fake_insufficient_items)
           allow(fake_storage_location).to receive(:increase_inventory)
             .with(fake_insufficient_items)
             .and_raise(fake_insufficient_allotment_error)
diff --git a/spec/services/donation_destroy_service_spec.rb b/spec/services/donation_destroy_service_spec.rb
index fdaaa654c7..f632df7dcd 100644
--- a/spec/services/donation_destroy_service_spec.rb
+++ b/spec/services/donation_destroy_service_spec.rb
@@ -67,7 +67,7 @@
         allow(fake_organization_donations).to receive(:find)
           .with(donation_id)
           .and_return(fake_donation)
-        allow(fake_donation).to receive(:line_item_hashes).and_return(fake_insufficient_items)
+        allow(fake_donation).to receive(:line_item_values).and_return(fake_insufficient_items)
         allow(fake_storage_location).to receive(:decrease_inventory)
           .with(fake_insufficient_items)
           .and_raise(fake_insufficient_allotment_error)
@@ -109,7 +109,7 @@
         allow(fake_organization_donations).to receive(:find)
           .with(donation_id)
           .and_return(fake_donation)
-        allow(fake_donation).to receive(:line_item_hashes).and_return(fake_insufficient_items)
+        allow(fake_donation).to receive(:line_item_values).and_return(fake_insufficient_items)
         allow(fake_storage_location).to receive(:decrease_inventory).with(fake_insufficient_items)
         allow(fake_donation).to receive(:destroy!).and_raise('boom')
       end
diff --git a/spec/services/transfer_destroy_service_spec.rb b/spec/services/transfer_destroy_service_spec.rb
index 246ca6439a..cd4d423b29 100644
--- a/spec/services/transfer_destroy_service_spec.rb
+++ b/spec/services/transfer_destroy_service_spec.rb
@@ -29,7 +29,7 @@
       allow(transfer).to receive(:from).and_return(fake_from)
       allow(transfer).to receive(:to).and_return(fake_to)
       allow(transfer).to receive(:destroy!)
-      allow(transfer).to receive(:line_item_hashes).and_return(fake_items)
+      allow(transfer).to receive(:line_item_values).and_return(fake_items)
 
       # Now that that the `transfer.from` and `transfer.to` is stubbed
       # to return the doubles of StorageLocation, we must program them
@@ -73,7 +73,7 @@
         let(:fake_error) { Errors::InsufficientAllotment.new('msg') }
 
         before do
-          allow(transfer).to receive(:line_item_hashes).and_return(fake_items)
+          allow(transfer).to receive(:line_item_values).and_return(fake_items)
           allow(fake_from).to receive(:increase_inventory).with(fake_items).and_raise(fake_error)
         end
 
@@ -87,8 +87,8 @@
       context 'because undoing the transfer inventory changes by decreasing the inventory of `to` failed' do
         let(:fake_error) { Errors::InsufficientAllotment.new('random-error') }
         before do
-          allow(transfer).to receive(:line_item_hashes).and_return(fake_items)
-          allow(fake_to).to receive(:decrease_inventory).with(transfer.line_item_hashes).and_raise(fake_error)
+          allow(transfer).to receive(:line_item_values).and_return(fake_items)
+          allow(fake_to).to receive(:decrease_inventory).with(transfer.line_item_values).and_raise(fake_error)
         end
 
         it 'should return a OpenStruct with the raised error' do