Where to Buy Secondhand Backpacks: A 2026 Marketplace-by-Marketplace Guide By Chester Takau · July 2026 Short answer: For a general everyday backpack, start with Facebook Marketplace and thrift stores — free or under $10 finds happen constantly, you just can't order to spec. For a specific brand or size, eBay and Poshmark have the widest selection but carry the highest counterfeit risk. For hiking and travel packs, REI Re/Supply is the safest bet (inspected, guaranteed, no membership needed to buy) and r/GearTrade the best value if you're willing to vet a seller yourself. Brand-run resale — Patagonia's Worn Wear and Fjällräven's Pre-Loved — sits in between: authenticated, but priced closer to new. Where can I actually buy a secondhand backpack? There isn't one best source — there's a best source per situation. General resale platforms (eBay, Poshmark, Mercari, Depop, Facebook Marketplace, OfferUp) cover the widest range of everyday and fashion back...