Today only, eBags via eBay offers the High Sierra Loop Daypack Backpack in several colors (Black pictured) for $19.99. Coupon code "PICKUPSALE" cuts that price to $16.99. With free shipping, that's $4 under last month's mention and the lowest price we've seen. (It's a low today by $10.) It has a tablet sleeve, beverage holder, and padded air mesh shoulder straps.

Note: the above coupon can be used once per account, with a $75 maximum discount.