Amazon offers the Sk*r Club Green Monster Backpack
, model no. 22BKPK58, for $7.81. Coupon code "30BLACKFRI" cuts it to $5.57
. Plus, Prime members bag free shipping
. (Non-members can spend $35 or more to bag free shipping; otherwise, shipping adds $6.48.) That's $24 off list and the lowest total price we could find. It features a front zipper pocket, mesh side pockets, and adjustable padded straps.