Get yourself an emergency backpack from Troika for the unexpected moments when you can use an extra bag. The Troika TREKPAK packs a punch despite starting folded small in its inner compartment. When unpacked, it transforms into a 4-gallon capacity backpack that can carry up to 22lbs. Its interior pockets, exterior mesh pockets, shoulder straps, and carry handle make it a highly functional backpack for various outdoor activities. Constructed with water-repellent polyester, it also has a special coating on the base and reflective strips on the outside