The Root Travel Carry On Backpack is the perfect travel companion. It has a lightweight yet durable design, with plenty of storage for your essentials and optional add-ons to give you the ideal amount of packing space, Capacity: 36-55 Liter. Its adjustable straps and breathable mesh back panel make it comfortable to wear and its water-resistant fabric keeps your items safe from wet weather. Ready for your next adventure? Root has you covered. Great for 3-5 days trip! Scroll in pictures to understand the size difference between small and large