I just found a nice deal on a HIGHLY rated backpack. Amazon has this Gonex Ultra Lightweight Packable Backpack! It is available in 8 different colors too.
The Gonex packable backpack is made of high quality water and tear resistant nylon material, with abrasion resistant SBS metal zipper and reinforced more than 14 places with bartack process.It fits into an ultra-compact pouch, so you can easily pack it in your suitcase for use at their destination as an extra bag for the trip. Perfect for day trips, vacation, travel, day hikes, school, camping and shopping, etc.
Unfold size: 44 x 30 x15 cm (H x W x D)
Compact Size: 16 x 16 cm (H x W x D)
Capacity: 20 liters
Main pocket is Large enough to carry what you need.
Pack-in pocket doubles as a inner pocket.
Breathable mesh shoulder straps.
Bottle holder on the both sides.
Easy to adjust the length and lock firmly.
Outer smaller pocket great for quick access such as guide books and camera.
Made with high quality water and tear resistant nylon material, with SBS metal zipper and bartack process.