Review on 👜 FREEMOVE Cooler Bag Protective Sleeve: Keep Your 2L or 3L Hydration Water Bladder Cool and Protected by Melvin Man

This is a well made bag that will keep drinks cool for hours. All seams inside and outside are finished with seam tape. It has a three-layer construction (canvas, foam, foil) as shown in this cutaway photo. Each side is about 3/16" thick. I modified mine with a sewing machine to fit an Osprey Seral 7 lumbar bag with a 1.5 liter bladder. Mine has no velcro to close and just lays on top of it Unzipped the backpack. After filling it with ice cubes and water and closing my backpack, I checked every hour to see how it was working. It still had the last bits of ice in it after 6 hours at room temperature, about 72F. An unmodified package with a valve will probably work even better.Worth it if you like cold drinks.