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The Shasta 23L Cooler

The Shasta 23L Cooler

The Lightest Backpack Cooler Ever

Regular price $149.00 USD
Regular price $0.00 USD Sale price $149.00 USD
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The Shasta is our flagship cooler - the biggest, best Monti Cooler we make still folds down tiny to fit any adventure! An independent test conducted by Outdoor Life found that it took 55 HOURS for 7lbs of ice to melt, tied with the industry leader's backpack cooler (you know who we mean... did we mention their cooler is 6 TIMES heavier?)

• Molds to any bag. 
• Backpack straps included.
• Packs up to fit in your backpack or tote. 
• Essentials Pocket - Exterior, Zippered
• Holds up to 23 cans, 5 bottles of wine, or a picnic for two!
• Compresses into its built-in stuff sack
• Keeps drinks cold for up to 55 hours
• Patent(s) Pending utility and aesthetics


Capacity: 23L (about 23 cans)
Weight: 17.2 oz! 
Cooler Open: 20"H x 10"W x 6.5"D 
Stuff Sack: 9"H x 9"W x 3.5"D

The Original Puffy Cooler™


Shasta: Holds 24 cans or 5 bottles of wine

Mayfly: Holds about 15 cans and tall enough for 3 bottles of wine :)

**Ice allowance not included


Ripstop Nylon
Hydrophobic Synthetic Insulation
Waterproof YKK Zippers


Cooler Open: 18"H x 9"W x 5"D 
Stuff-Sack: 8"H x 7.5W" x 3"D
14 liter capacity

Cooler Open: 20"H x 10"W x 6.5"D 
Stuff Sack: 9"H x 9"W x 3.5"D 
21 liter capacity

Shipping & Returns

Free Shipping in the USA!
Monti Guarantee: If you're not happy with your cooler return it unused for a full refund in the first 30 days!

Care Instructions

Easily turn inside out to clean and dry. Hand wash with cold water.

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Product Walk-Through

Monti Mayfly 14L High Capacity Lightweight Travel Cooler. Folds into built in stuff sack. Packable Cooler Blue.

Sized for the Occasion

The Mayfly (left) holds about 15 cans, or 3 bottles of wine.

The Shasta (right) is big enough for a full day in the sun with a whopping 24 can capacity (about 5 bottles of wine)!


Frequently Asked Questions

How long will it hold ice?

30 Hours+!

Truth is, it depends on conditions(110 degrees outside or nice spring day), but we think of Monti as your "All Day" cooler. In tests we've conducted it kept temperatures ice/water below 40 degrees for over ~36 hours in a 70 degree room.

What are the dimensions?

18"H x 9"W x 5"D
14 liter capacity

20"H x 10"W x 6.5"D
21 liter capacity

How do you use the stuff sack?

The stuff sack is built into the cooler itself. The exterior zippered pocket IS the stuff sack. Simply reach into the pocket, grab a big handful of the body of the cooler and start to turn the cooler inside out, pushing the body of the cooler into the inside out pocket you've created. The cooler's convenient stuff sack is seamlessly integrated into its design, making it easy to store and carry.

What is the return policy?

Monti Guarantee: Changed your mind? No problem! Just let us know and you can return your unused cooler for a full refund within the first 30 days of purchase.

Which size should I get?

If you're unsure, consider the Shasta, as it is the most versatile.

The simplest way to decide is by looking at the capacity. The Shasta will never be "too big" because the roll top design ensures that it is compressed down to match the size of what you have inside it. (ie if you have only 6 cans in the cooler, you will roll the top down further). So really it comes down to your needs. Picnic with friends? Shasta. A simple bottle of wine and a few water bottles or a lunch sack for work? The Mayfly is perfect.