This is an important topic.
I was thinking something not spendy but functional.
Exterior Dimensions (in - L x W x H) 18.235 x 12.5 x 15.385
Igloo 28 Quart Island Breeze Cooler
I want this shape because it could fit beside your leg in the captains bay on some boats.
I was thinking of making a fabric/cheap closed cell foam/fabric holder for it that the cooler would snug down into.
A Delrin type side release buckle over the top to allow quick access but restrain in flips.
Padding helps with refrigeration and leg bumping. Rounded corners could help also.
Lunch, beverages, next evenings frozen meal thawing.
Easy to take up to camp.
up to 37 standard cans