Forty Below Bottle Boot
0.5 Liter size


Available in stock

Quick Overview

The Forty Below® Bottle Boot™ 0.5 Liter/16 oz. size is an insulating water bottle cover. It keeps water from freezing, especially in extreme cold environments.

Please see below for additional information.

Color Choice *


The Forty Below® Bottle Boot™ .5 L size is a very insulating water bottle cover, to help keep water from freezing, especially in extreme cold environments.

We have been making Bottle Boots™ now for over 40 years! They have been used and trusted and on just about every type of outdoor trip, from winter day hikes to extreme cold and high altitude expeditions worldwide!   This very insulating water bottle cover, is specifically designed to help keep water from freezing, and easy hold onto and open and close with gloves or mittens on.  The low profile, non bulky design takes up less room in your pack, and less bulk when on a backpack hip-belt, sternum strap, or jacket chest pocket.

Key Features Forty Below Bottle Boot .5 Liter/16oz. Size:
Thick Insulated Bottle Cover.
Fits most .5 Liter/16 ounce size water bottles (Nalgene, German, etc).
Helps keep liquids from freezing in cold conditions.
Helps keep liquids cool in warm conditions.

Low Profile Design.
Thick 6.5mm Closed Cell Neoprene foam nylon covered insulation.
Does not absorb water.
No zippers to break or freeze.
Webbing belt loop.
Velcro front closure.

insulated bottle cover 16 ounce size made by Forty Below
Insulated bottle cover for 16 ounce size water bottle shown on sternum strap of a backpack, made by Forty Below Ltd. USA.

Check out this review of the Forty Below Bottle Boot .5 Liter size from the ROBONZA: All About Mountain Gear Blog:

Here are links to the 6 sizes of Bottle Boots that we make:
.5 liter/16oz.
.75 liter/24oz.
1.0 liter/32oz.
1.5 Liter
48 oz.
2 Qt.

Here is a link to the main Bottle Boots and related products page in our website:


The Bottle Boot™ name is a declared Trademark of Forty Below Ltd, and is an original product that we invented, designed, manufacture, sell, and has been used around the world since 1980. Any use of the name: “Bottle Boot”, “Bottle Boots”, or the design of the product, or trade dress, is prohibited.

© 2020

Product Photo Gallery:

Put the cursor over the picture to see the heading. Click on the picture to enlarge it and to view the full description. An arrow on the edge of the picture will enable forward and back movement through the set of pictures.

Forty Below Bottle Boots 0.5 Liter in use:

Forty Below®  Bottle Boot™  .5 Liter/ (16oz.) size

Insulation:  1/4″ (6.5mm) thick stretchy nylon covered closed cell foam (wetsuit type material).  Same thickness completely around the bottle.

Fits: most 16 ounce/ 500ml water bottles.

Fits a bottle up to 3 inches in diameter, and 7 inches tall.  Stretchy material so it can flex with different shapes of bottles.

Weight: 3 oz (84g)

Colors: Black, Royal Blue, Red, Yellow, Purple.


© 2020

Additional information

Weight .4 lbs