Small but very sturdy, the Ultralight Backpack from Sea To Summit has a capacity of 20 liters for only 72 grams. Made of water-repellent Ultra-Sil Cordura, this bag will surprise you with its excellent durability. This bag can go with you everywhere and be folded into a very compact small pouch. A very practical small bag that can be carried as a keychain! Sea To Summit - Ultra-Sil Day Pack - Backpack