Ordered this as a smaller cooler to compliment my OtterBoxcoolers. Saw 2-3 day ice retention spec, and figured it would be good for quick outings. Past maybe a single day, it has a hard time keeping it cool. Have 3 flat ice packs in it, AFTER precooling it, and it has no cooling capabilities after only about a day. It is very easy to carry, and seems well built. Just not performing as well as I hoped. Should still work for drinks and lunch on the raft/ boat.
My small OtterBox is about 7x more effective, but has handles that stick off the sides. That is the ONLY think I don't like about it. Handles sticking out may a bit of an issue when you have it on a raft or boat. Was hoping the Mammoth would be a slightly less efficient, more form fitting alternative, but it sadly falls short. Maybe the Rangers perform significantly better.