Amazon offers Prime members the Laluz Packable Waterproof Traveling Backpack in seven styles (C pictured) for $8.99 with free shipping. (Non-members can spend $49 or more to qualify for free shipping; otherwise, shipping costs $5.58.) That's $3 under the lowest total price we could find for a similar item elsewhere. Each backpack folds into a small pocket and features padded shoulder straps and bottle holders.