Water Resistant & DURABLE: Made of Water Resistant high-density polyester material. BOVIP 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. Breathable Mesh Padding and Whistle : For passionate hikers or trekkers, it with the ventilated mesh padding shoulder straps and backside, breathable system and lightweight design are the perfect hiking backpack for outdoor sports. Ergonomically designed provides body comfort even when pack is completely full. Keep it cool even in summer. Large Capacity & Multi Compartment Bookbag: Trekking Backpack with 40L storage space(23.6inch x 12.5inch x 8inch).It features with multi-compartment design includes one main zipped compartment, one zipped front pockets,mesh bag and two side pockets. The main compartment have dividers to support 15.6-inch laptop placement and small zippered pocket are convenient enough to help you further organize things.Large capacity helps you easily organize all your essential items.