5.5L Hydration Pack – Multifunction Storage System- Hydration Backpack with Storage – Lightweight Running Backpack Cycling, Hiking, Ski, Snow for Men, Women & Kids

• 1,Size:S/M:chest circumference 30.31-33.86in M/L:chest circumference 32.87-36.42in L/XL:chest circumference 35.24-38.78in
• 2,Material:Nylon/polyester-Durable and Practical Companion for Your Outdoor Adventures
• 3,"All-in-one Adventure Pack: Men's Outdoor Backpack for Running, Cycling and Travel"
• 4,"Versatile Rucksack Bag for Men: Perfect for Sports, Travel and Everyday Use"
• 5,Ergonomic design,makes the bags blend with people