eBags takes up to 65% off select items during its Back to School Sale. Plus, take an extra 15% off select backpacks via coupon code "ADWSCHOOL". Even better, these orders qualify for free shipping. A couple best bets after coupon:
eBags offers the JanSport Half Pint Backpack in six colors for $24.90. Coupon code "COMJBTS10" drops it to $22.41. With free shipping, that's the lowest total price we could find by $3. It features adjustable shoulder straps, key clip, front pocket, and measures 12x10".