W&A via Amazon offers the Outlander 20-Liter Packable Handy Lightweight Travel Hiking Backpack in an array of colors (Black pictured) for $16.82. Coupon code "HTJTSMJY" cuts that to $12.61. Plus, Prime members bag free shipping. That's around $12 less than what most eBay vendors charge. It features two side mesh pockets, a front zippered pocket, and two other zippered compartments.