Amazon offers Prime members the Targus Ascend 16" Laptop Backpack, model no. TSB710US, for $14.99 with free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping costs $9.) That's the lowest total price we could find by $15, although it was $2 less on Black Friday weekend. It features internal and external accessory pouches, padded adjustable shoulder straps, two mesh water bottle holders, and padded back panel.

Orders placed by December 22 are guaranteed to arrive in time for Christmas via Prime shipping.