Made of Water Resistant high-density polyester material. Camping backpack is made of extra thick, tear-resistant, water-resistant and anti-abrasion polyester fiber. All stress points are reinforced with bar tacking to increase its longevity. Ergonomically designed provides body comfort even when pack is completely full. Keep it cool even in summer. College Backpack with 40L storage space(20.5inch x 13inch x 7.1inch), this backpack features with multi-compartment design includes one main zipped compartment, one zipped front pockets and two side pockets. One separator and one small zippered pocket in the main compartment are convenient enough to help you further organize things. Large capacity helps you easily organize all your essential items.