The Yeti Hopper line has long featured this large soft-sided cooler bag with an over-the-shoulder strap and plenty of space for weekend camping trips. With the M30, they've upgraded this bag from the traditional leakproof zip-top to a new generation of watertight magnetic closures. But before you get all excited about walking away from the struggle of giant, tough zippers, know that there's a host of new and different challenges that go along with this change. Beyond the top closure mechanism, this remains the same old tried-and-true cooler. We retested this latest model along with the rest, but the biggest change is that magnetic strip instead of the standard Yeti zipper.