Amphibious backpack

An amphibious backpack comprising a body having an open top, a cover detachably mounted on said open top of the body, strap means on said body for fastening the backpack to the user, said body comprising front, central and rear compartments successively juxtaposed on one another, the rear compartment being closest to the back of the user, an inflatable bladder in said front compartment, means for inflating said bladder, a sealable first sack in said central compartment for personal belongings of the user, a sealable second sack containing at least one sheet of foam material which can be used as a mattress in said rear compartment, said front compartment, central compartment, and rear compartment having bottom regions respectively provided with openings for drainage of water from said compartments, said strap means including straps and a releasable clamp means for detachably connecting said straps, said strap means having a first configuration in which the backpack can be worn by the user when walking on the ground and a second configuration for use in water, said clamp means being constructed to permit concurrent release of said straps in said second configuration to enable said body to be separated from the user, when in water and a line connected to the backpack including means for connection to the user and of a length such that with the backpack released from the user and floatable in water with said bladder inflated, the user is fully submerged and tethered to the backpack and can carry out underwater activities.