I also like the UEBoom 2 speaker(s) for travel. Great up front on the boat, take them to the beach, and the waterproof feature is pretty good (mine's been dropped in a few times!). I used to have a Braven model, but forgot to screw the cap back on after charging that one, and it died in a dinghy on JVD. The UEBoom has a rubber cap over the charging hole that stays on it, and just has to be snapped back in place. Much better design.