If you're looking for a good deal on a backpack, look no more.
Wal-Mart has the Eastport Dome Backpack for $9.88. Some product details:
Dual-zipper panel-loading design enables convenient storage and easy access
Two mesh side pockets for easy-access items, such as water bottles, gym pass, library cards, etc.
Front-pocket organizer includes detachable keychain holder
Padded lumbar support
Contoured padded shoulder straps
Bungee cording along the front panel provides storage for larger, easy-access items, such as towels, tees, etc.
Measures approximately: 12-1/2"L x 7"W x 17-1/2"H
Wal-Mart has a great selection of other backpacks at similar prices -- click here to browse.