Rafting or white water rafting is a challenging recreational outdoor activity using an inflatable raft to navigate a river or other bodies of water. This is usually done on white water or different degrees of rough water, in order to thrill and excite the raft passengers. The development of this activity as a leisure sport has become popular since the mid-1970s. It is considered an extreme sport, as it can be dangerous. The modern raft is an inflatable boat, consisting of very durable, multi-layered rubberized (hypalon) or vinyl fabrics (PVC) with several independent air chambers. The length varies between 3.5_m (11_ft) and 6_m (20_ft), the width between 1.8_m (6_ft) and 2.5_m (8_ft). The exception to this size rule is usually the packraft, which is designed as a portable single-person raft and may be as small as 1.5 metres (4.9_ft) long and weigh as little as 4 pounds (1.8_kg). Rafts come in a few different forms.
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