Makino via Amazon offers the Makino 60-Liter Waterproof Backpack in several colors (Grape Purple pictured) for $77.99. Coupon code "4DKKTVXO" cuts it to $50.69. With free shipping, that's $27 off and the lowest price we could find. It features an internal frame system, several pockets, and padded, breathable mesh back panel and shoulder straps. Deal ends December 20.