Features:

-LIGNTWEIGHT FOR HIKING: Our hydration backpack weights 0.51 pounds and is super light, reducing much of the load during the trip.When it comes to hiking, the shorter you plan to spend on the trail, the lighter pack you'll need. 
-5L LARGE CAPACITY: Large capacity design which allows you to fill your helmet in easily. The maximum loading weight is 22.05 pounds, two side pockets for even more space. 
-MULTIPLE STORAGE COMPARTMENT: Designed with 10 exterior pockets, you can store all tiny items such as vacuum cup, keys, phone and cash etc. These pockets also allow you to get the things directly, extremely convenient.The model equips with an emergency blanket( 160 x 210cm), a thermal insulation bag and an emergent whistle, meeting all you need thoughtfully. 
-STRONG FRAME AND DURABLE MATERIAL: Made of ultralight elastic nylon cloth, polyester, breathable mesh back and shoulder strap, the product devotes itself to an effective helper, not only comfortable but durable. 
-FIT YOU WELL: Ergonomic designed vest-shaped bag coming with adjustable waist strap and high elastic chest strap,two sizes for your option.This backpack can be used for more than just hiking.It is suitable for almost all outdoors activities such as running, riding, camping, marathon, etc. 

Specification:
-Model:C928#
-Material:nylon/polyester
-This product is compatible with 2L water bladder ( not included )
-Water bottle:500ml x2(not included)
-Net Weight:approx 200g(included)- Capacity: 5L
- Bag size ( L x H ): 39 x 41cm / 15.35 x 16.14 inches
- Chest circumference: 78- 90cm ( S / M ); 88-100cm(M/L); 98-108cm ( L / XL )
- The maximum loading weight: 10kg