60L capacity can hold all your daily necessities such as tent, moisture pad, sleeping bag, alpenstocks, clothes, climbing shoes, Macbook, ect. And it meets size requirements for most airlines, enough room for 3 or 4 days trips. Breathable mesh back panel with sponge padding help relieve the stress from your shoulder. Widened and thickened S-type shoulder straps and high elastic breathable back support for best ventilation and easing burden.