I think this bag might work pretty well.
Extra Large Floating Blind Bag Extra-large Floating Blind Bag is water-resistant and features lots of pockets for storing waterfowl equipment. Zippered dry pocket keeps valuables safe. The bag is reinforced with closed-cell foam to keep it afloat. AdvantageŽ Max-4 HD.
Model #08739...Extra Large Floating Blind Bag NEW