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The Igloo site has these exterior dimensions for the 36 qt Marine cooler.
Exterior Dimensions (in - L x W x H) 24.25 x 13.56 x 13

I think those dimensions include where the handles protrude out slightly.

See the 36 qt Igloo Marine Cooler and sizes here:
http://www.igloocoolers.com/commercia...art-Marine

Let us know what works out for you.