AltaTac via eBay offers the Every Day Carry Tactical Defense Canvas School Bag
in Digital Camo (pictured), Black, or Pink Camo, for $12.99
with free shipping
. That's the lowest total price we could find for this bag in any color by $13. This backpack features a padded compartment for laptops up to 15", padded shoulder straps, two extra-large side pockets, and more.
(Unless your school is in the forest and you're sporting the Digital Camo bag, this probably offers no actual tactical defense.)