Cooler for Prowler 13

[Pryorok]

Any suggestions on a cooler to keep fish in? Currently I have an older Ocean Kayak Prowler 13 and having problems finding a cooler that will fit cross ways in the tank well behind the seat. I think the width is only about 13" wide. Would like one with attached lid to where I can use one hand with fish, flip the lid and drop fish in. Just wanted some ideas on what everyone was using. Mainly fishing for crappie and gills. Currently using a floating fishbasket to hold fish, but as water warms up this is not the best and want something to keep the fish cool. Thanks for any suggestions.