This backpack is perfect combination of waterproof Nylon, ultra-thin mesh and breathable air cushion. You don't need to worry about your backpack to be soaked by your sweat or drizzle; And the weight of backpack is only 270g because of its ultralight fabric, no pressure while doing a long-term exercise, such as running, climbing, cycling, and marathon.

Specification: 
Type: Sports Backpack
Material: 60D Light-weight Waterproof Nylon + 210D Terylene
Color: Black / Blue / Rose Red / Red (Optional)
Dimension: 33 * 17 * 8cm / 13 * 6.7 * 3.2in
Gender: Suitable for both men and women 
Capacity: 8L
Weight: 270g / 9.5oz
Belt (perimeter): Max.135cm /53.15inch

Washing Instruction: 
-Don't wash with liquid detergent or bleach. 
-Clean with wet cloth if necessary. 
-Dry naturally. 

Package Includes: 
1 * Backpack
1 * 1.5L Hydration Bladder

• High quality water and tear resistant Nylon material.
• Durable abrasion resistant metal zipper.
• Light weight (9.5oz) and Roomy (8L).
• Comfortable wide breathable mesh shoulder straps, comfortable to carry.
• Many pockets satisfy every of your demands. 2L Hydration Bladder is included.

High quality water and tear resistant Nylon material.Anself