Simple way to keep the cardboard box dry while in a cooler. Sides of sleeve will not collapse with wine removed. Just cut off the cardboard flap over the spout. The spout will then retract into the box as it placed in the sleeve.
Arrow pointing to location with flap removed:
Harbor Freight Super Glue was used on the flaps. Bonds extremely well and is not affected by cold.
Gently score the outside edges with a utility knife, then fold. Small bead of silicone sealant used on the bottom seams.
Box wine comes in different sizes. I simply made all four side panels 5" wide by 11" tall.
Works with several brands. Will need to buy more wine for additional "research."
Here is the material from Home Depot. $28.00 for a 4' x 8' sheet.