The North Port Backpack from Columbia will work great for school or a day of trekking.
Omni Shield advanced repellency
Contoured padded shoulder straps
Foam padded back for comfort and support
Padded laptop sleeve fits up to a 15" laptop
Separate organizer compartment with carabiner
Dual stretchable side water bottle pockets
600 denier coated oxford
Reflective safety accents
External bungee storage for wet/dirty gear
Web grab handle
Dimensions: 18.8" x 12.3" x 6.3"
Volume: 1727 cu. in.