Beautyflier Neoprene Water Bottle Sleeve Insulator Cooler, Compatible with Nalgene Water Bottle 32 OZ, with Adjustable Shoulder Strap for Hydro Flask Wide Mouth Bottle 32oz, etc.

I like that it fits the common Nalgene size bottle. The bag is sturdy and easy to take to the park.

J’utilise cette housse en Néoprène avec une bouteille Nalgene lorsque je fais bouillir de l’eau. Je m’en sert comme bouillotte dans le sleeping bag lorsqu’il fait froid. Garde bien la chaleur de l’eau et évite les brûlures sur la bouteille dans cette circonstance. Je suis très satisfaite.

works well for a 32 ounce Gatoraid.Keeps drinks cold a long time.Zipper keeps drinks snug, will not fall out.Having a strap is a plus, can also attach it to a backpack with a carabiner

My 1L Nalgene bottle fits perfectly in this insulated sleeve. It definitely keeps the inner liquid cooler for longer than an unprotected bottle, and I don't cringe every time I accidentally drop it on the pavement anymore. The strap is so useful for hiking!

I looked for a long time for a water bottle insulating sleeve but most everything was not really all that great or the size would not work on my Contigo 18-20 oz bottle. Finally, I found this sleeve that had the measurements to fit the aforementioned Contigo bottle. As we so many things online, I was a little apprehensive on whether it would fit not only the height but also the girth around the bottle specially since the particular one I have is narrower at the bottom but wider at the top. It turned out to be a perfect fit. Better yet it actually does a true insulating job on keeping the water cold. I usually walk around 1.75 hours or 11 - 12k steps in the mornings In sunny and balmy Florida. The real test is that the water is not just cold but there is still ice in the bottle at the end of my walks. I dislike warm water from any container, with this sleeve I do not have any such issues. The sleeve comes with a sling which truth be told, it is not very useful, the Contigo bottle has a built-in 2 finger plastic loop which is how I carry the bottle. BTW, the bag in no way interferes with the plastic loop when opening the flip top to drink from the bottle. Yes, I am very happy with this insulator bag, it is well made and appears it will last for a good while.