YETI Tundra Hard Coolers meet the Interagency Grizzly Bear Committee (IGBC) standards for bear-resistant containers when used with extra-long shank Master Lock Padlocks. Yeti’s Tundra Hard Coolers have been thoroughly tested in both controlled bear simulations and with wild grizzly bears. When padlocks are used properly, grizzlies get nothing but frustrated after coming across your cooler.