1)  Back flow air exchange system,3mm aluminium alloy support 

2)  Adjustable shoulder strap, chest strap and hip belt

3)  Ice axe/walking pole attachment point

4)  Strengh webbing handle

5)  Thick sponge waist cushion

6)  Top lid with zipper,can put small items

7)  Dual side expandable  capacity zip pockets

8)  Base compartment enlarge capacity,and aslo can be opened to get things which you put in bottom

9)  With rain cover

10)  Water outlet hole

11) SBS zipper,YNS buckle,ensure quality