I'm heartbroken it broke in storage, of course, but I put a damaged Toy Soldier US Vietnam Rucksack frame from the Longgrear set on Ebay auction starting bid .99 (BIN 15.99)...or maybe make me a reasonable offer to sell via OSW.

1:6 Toy Soldier Vietnam Backpack Frame 12" GI Joe Dragon BBI Dam ACE Hot | eBay