The modern raft is an inflatable boat, consisting of very durable, multi-layered rubberized (hypalon) or vinyl fabrics (PVC) with several independent air chambers. Typical lengths vary from 6 m (20 ft) (with a width of 2.5 m (8 ft)) down to very portable single-person packrafts which may be as small as 1.5 metres (4.9 ft) long and weigh as little as 4 pounds (1.8 kg).