Reliable Fish Bags feature 1/2" closed cell foam insulation incased in 18oz vinyl, each fish bag incluldes a drain plug, UV and Mildew resistant double stitched seams and corrosion resistant YKK zippers. All bags are tapered at the bottom. example a 30" x 60" bag stands 30" tall with a zipper length of 60". The sides taper on the ends so the bottom of the bag is 12" less than the top. A 60" bag tapers down to a 48" bag.