[20L travel bag that can be expanded according to the purpose] Tiger Brook Series [Product Features] - Columbia's unique water repellent function "Omni-Shield" - Backpack recommended for 1-3 night trips and business trips - Can be expanded to 8L by opening and closing the zipper - Large mesh zipper pocket on the front side inside the main compartment - Open pocket on the back side inside the main compartment - Main compartment and PC three - Lockable zipper on the back - Organizer pocket on the back side of the second compartment - Mesh zipper pocket on the front side of the second compartment - Simple security system on the second compartment - Reflective logo print on the shoulder harness - Removable chest strap - Elastic band to hold the side compression together - Capacity 20L- 28L// [Material] 840D TM OX (100% nylon) [Size range] One size