1) 80L large internal frame packs. 2) removable and adjustable shoulder strap, user-friendly design can be adjusted to suit your height. 3) high-quality waterproof fabric. 4) large main compartment, computer compartment. 5) Super additional expansion 10CM (90cm-105cm high). 6) 2 Covers (personal rain cover, large rain cover) Wrap plug more things are not afraid of getting wet. 7) SBS zipper China zipper best brand can withstand pull together more than 10 million times 8) Accessories: temperature, cold.