The ULTRALIGHT Stuff Pack from Osprey has the extra storage you need when you’re on the road. This versatile pack goes from an 18L backpack to a pocket-sized pouch with a few easy folds. The main compartment has plenty of room for all your day trip needs. The stretch mesh side pocket ensures you stay hydrated on the go. The deluxe air mesh harness keeps you cool and comfortable while providing you with plenty of support. 40D Nylon ripstop is ultra-durable and will keep your stuff protected in rainy weather.