When I was in the RAF I was a lifeguard and used to teach kids and adults how to swim, so was very fit, very good swimmer and used to being in the water etc. We put an aircrew dinghy in the pool one day and I had trouble getting into it, I was surprised by the effort it took to get in, bale out and do up the fastener. That was in a swimming pool so I have to say that carrying a life raft without proper training is just for comfort unless you have had proper training in a pool or preferably the sea with the life raft you carry onboard your a/c.
Immersion suits would be a far better bet than carrying a liferaft.