Bear resistant coolers for canoe camping...

I thought I wanted an Otter Box cooler over a Yeti cooler but when considering the size of cooler to capacity ratio the Otterbox Venture 25 (I think) takes up a LOT of space for not a lot of capacity. The Yeti 20 has a smaller capacity but it seems to take up considerably less space.

These aren't the only brands either.

Any of you have your favorites, especially taking into consideration the size to capacity ratio? I know these things have thick insulating "walls" but I need to strike a balance - lots of cooling space for taking up the least amount of space.

Thanks