The YETI Hopper Flip 18 Soft Cooler is a haulable cooler for weekend trips into the outdoors. When the adventure goes further, this soft cooler is easy to carry, while the DryHide Shell provides durability against dirt, grime, rocks, and brush. The ColdCell insulation is a closed-cell rubber foam to keep lunch, a sixer, or whatever cold drinks and food are needed to keep a small crew happy. The HydroLok Zipper is 100% leakproof, so close it up, slip the shoulder strap over the shoulder, and trek out towards the waterfall.