-STRONG FRAME AND DURABAL MATERIAL: Made of ultralight elastic nylon cloth, polyester, breathable mesh back and shoulder strap.
-FIT YOU WELL: Ergonomic design, Vest-shaped bag coming with adjustable waist strap and high elastic chest strap, two sizes for your option.
-LIGNT WEIGHT AND GOOD VOLUME: Weight 0.51 pounds, Capacity 5L. The maximum loading weight is 22.05 pounds, two side pockets for even more space.
-MULTIPLE STORAGE COMPARTMENT: Designed with multiple exterior pockets, large enough to hold all your necessity
-FOR UNISEX: Designed for men and women, the younger and the older. Good for all ages.
Material:75% nylon, 25% spandex
Lining: 100% polyester Net Weight:145g
Water Supply: 2L water bladder (not included)
Standard: QB/T 1333-2010
S/M is suitable for 75.5-84.5cm chest circumference
M/L is suitable for 83-92cm chest circumference
L/XL is suitable for 89.5-98.5 chest circumference