I purchased 2 XL backpacks for my fishing trip to Costa Rica. Today on the way home I packed both with frozen Mahi and tuna steaks. The trip home was a total of 18 1/2 hours between taxis and connecting flights and to my surprise all the steaks were still frozen! Great product! I would like to make it small recommendation, if you can please install a handle on top. With my trip each backpack had about 35 pounds if steaks and I was concerned the plastic buckle would give out.
