What are the rarest backpacks?
<p>Ive been accidentally been building up a collection of backpacks and seen some strange prices on backpack the market for backpacks that I didnt think were that uncommon so I was wondering..</p><p><strong>What are the rarest Backpacks?</strong></p><p>What they are and if possible how they are obtained. Any info will be much appreciated</p>