Whether it’s an all-day float or one last hoorah at your favorite swimming hole, music goes a long way. For a bomber bluetooth speaker that won’t fizzle out from a few splashes, check out Soundcast’s VG1. Light and compact, it stashes in a pack, then busts out crisp, full-range sound and a 15-hour battery life. Should you drop it overboard, no worries: just pluck it out and shake it off. $150.