The Shasta is our flagship cooler - the biggest, best Monti Cooler we make still folds down tiny to fit any adventure!
• Keeps drinks cold for up to 55 hours • 23L Capacity: Holds up to 24 cans or 5 bottles of wine • Compresses into its built-in stuff sack • 6x lighter than the competition • Backpack straps included • Machine washable • Leak-proof
See it in action
Details
Capacity Holds 24 cans or 5 bottles of wine **Ice allowance not included
Dimensions Cooler Open: 20"H x 10"W x 6.5"D Stuff Sack: 9"H x 9"W x 3.5"D 23 liter capacity
Use the roll-top for peak performance and comfort. We also find the product performs best with ice packs rather than ice in higher humidity environments if you are concerned about condensation.
Shipping & Returns
Monti Guarantee: If you're not happy with your cooler return it unused for a full refund in the first 30 days!
Holiday Gift Return: Unused coolers received as gifts, purchased after November 1st, can be returned until January 25th.
Christmas Shipping Deadline: Order's placed on or before December 18th to the continental United States will ship out in time to arrive for Christmas.
Care Instructions
Easily turn inside out to clean and dry. Hand wash with cold water.
Purchased the Shasta 23L Cooler before my trip to Malta and I'm so happy I did. I debated which size to get, but this was the perfect size to take on hikes, the beach, and even became my carry-on when traveling home. I was amazed at how cold my beverages & snacks stayed in the cooler all day long in the hot sun. I also purchased a lightweight dry pack for the clothes to stay dry in the bag, but the pocket on the Shasta was large and great to hold all the important items (wallet, keys, phone). As items were consumed, was able to adjust the size of the bag with rolling the top down. Highly recommend!
Christie C.5/5Verified
This cooler has been absolutely amazing. My husband and I take it everywhere. We went on a 9 hour flight and used it all the way to our destination.
Miriam A.5/5Verified
Loved how comfortable it was to wear and how much it held! Kept everything cool on our 5hr hike!
Jenny W.5/5Verified
My husbands favorite Christmas Gift!!! We travel often and this cooler is the best… keeps ice for days
Jodi C.5/5Verified
A very versatile and high quality bag. I use it at the golf course for drinks and just keep it in my car to use as a grocery bag or just to carry everyday items in. Ice remains solid in it throughout the day with no leaks. Looking forward to bringing this with me on my travels especially since it can pack down to a convenient size.
Bunnarith T.5/5Verified
Brought my Monti cooler to Vieques, Puerto Rico for a beach day! Kept our drinks cold and sand free - plus it was super easy to throw it on my back and move with us as we made our way down the beach.
Nina E.5/5Verified
Overall nice product. Probably not worth more than $75. Quality is fine although one shortcoming - the straps. They are flimsy and don't stay secure around your shoulders. Don't plan to use this for a hike - maybe a short walk to the beach.
The US emblem is a nice touch - but overpriced in my opinion.
Stephen K.4/5Verified
We took the Monti Mayfly 14L Cooler on a trip to St. Thomas, USVI, and it was perfect for boating and beach days. It’s lightweight, easy to carry, and kept our cans cold all day in the hot sun. A huge bonus is that it folds into a very small, packable pouch, making it ideal for travel.
The cooler is also stylish, especially with our Clemson Tiger patch, which gave it a fun, personalized touch. Highly recommend for trips, beach days, concerts, and tailgates.
Steve M.5/5Verified
Clubhouse and halfway house were closed on Christmas Eve..so Monti to the rescue! It was perfection! Also it was kinda damp and we set it on the grass many times to swing and our light blue one came out looking like brand new after the round! So maybe it’s stain resistant? And some of us just swung with it on our back and that worked like a champ too!
Jill O.5/5Verified
Week long at the beach, it was a game changer! Packed drinks and launch and was cool all day.
Rob G.5/5Verified
What a pain in the ass! Trying to fold the “ice chest” into the little built-in POS pocket/pouch! I’ve been trying for 30 minutes to get it in but to no avail. I’ll see how it holds ice this weekend. But, as of now it’s on the send back list!
Hugh P.2/5
Well built and portable. Great for packing in your luggage.
Ted P.5/5Verified
Packed our Monti cooler for our flight to Boston for a New England trip. Took it all over Massachusetts, Rhode Island, Connecticut, Vermont, New Hampshire, and Maine. Kept our beer and snacks cold, easy to carry and pack for the flight home.
Justin S.5/5Verified
Monti travel cooler recommended by my friend is indeed cooler than your average cooler. Waterproof, light, comfy backpack straps, and unlocks legit TSA workaround- you can bring a full water bottle and a quart of frozen Greek yogurt through security as long as they are frozen solid. Even the 2 TSA agents were like wow this is so cool(er) 😎
Sara C.5/5Verified
I loved it at first. I’ve only used as a day lunch bag a handful of times for work conferences, so have not used for outdoor activities like many of the advertised photos being at the beach or lake as a “cooler”…so how the bag looks now is a bit baffling. It makes me question the quality especially for $130 at the time and that’s with the first time discount. I noticed there aren’t reviews of this color so I wonder if that’s why it’s no longer available because it shows more of the stains? Or if I just happened to get a lemon I don’t know? Very disappointing. If it looks like this now I can only imagine if I had used for outdoor trips
V M.3/5
I just took my Monti cooler bag on a trip through three national parks—Zion, Bryce Canyon (pictured), and Arches—and it was awesome. I hiked so many trails with it, and it never let me down. I tossed in some ice to keep my water and electrolyte drink cold, packed snacks and a few necessities in a dry bag, and it worked perfectly. One of my favorite parts was having the cold water from the melted ice to cool me down on a really hot hike in Zion.
The only thing I wish it had was the option to use a hydration bladder instead of just my Nalgene—hopefully that’s something they’ll add in the future. Overall, lightweight, practical, and reliable—this bag definitely made my adventures enjoyable.
Sarah B.5/5Verified
I just love it! Took it on a trip and used it as a day pack. The insulation added protection to my camera and binoculars while keeping all my purchases dry! Easy back pack style allowed me to carry other stuff too!
I will be purchasing more Monti for sure!
Jennifer5/5
The Monti cooler works like a dream! Super light weight and keeps everything cold for hours at the beach, camping, and even just by the pool. I was amazed at how much it holds, too! Best purchase ever!
Trisha W.5/5Verified
Best. Cooler. Ever. Bought it for my husband for Father’s Day. He took it on a fishing trip in northern Minnesota. At the end of the trip, he was determined to bring home some walleye. Freezing it first, he used the cooler to pack and fly home to Florida. His flight was delayed, missed his connecting, and had to stay in PHL for the night. His hotel room only had a small fridge so he put the whole cooler in the fridge. The fish remained mostly frozen after 30+ hours of travel and we made the best meal from it, all because of the Monti! The Monti will travel with us everywhere we go!
Christy U.5/5Verified
Flight attendant here!
I love this cooler so much. I work long-haul international trips, and don’t need a cooler on the way there, per se. But always want one for the way back to house my cold food hauls. This baby is a gem!
Folds into itself so it takes up minimal space in my bag, but expands into a spacious, insulated carry-all for the way back. I’ve stuffed 5 bottles of wine inside from Lisbon, stacks of butter and cheese from Paris, and this photo was taken in Athens, where I packed it full of feta, olive oil and honey for the way home. I love the backpack straps and how they are removable. I generally use one and hang it over the handle of my roller, draped over my carry-on item. But having both means I can use this during a layover on a hike, a catamaran, or just doing my grocery shopping.
Cinq étoiles! (Five stars)
Kyle C.5/5
We love the Monti Mayfly backpack cooler! Packs easily in our carryon and comfortable on our backs while walking to the beaches! Impressive - the Monti kept our drinks cold on ice in 85 degree sun for 8+hours! Highly recommend!
Sharon P.5/5
Prior to the Monti cooler, I was the embarrassed mom putting field trip lunches in my hot purse just because I didn’t want to carry anything! I broke down and found the lightest, most comfortable, cutest cooler that actually keeps everything cold inside! I tested this out for 2 days on the boat and it delivered! I highly recommend this very portable lightweight non leaking, hands free, comfortable cooler!
Darbie P.5/5Verified
10/10 cooler right here y’all. Light as a feather and small as a mouse when condensed, the Shasta makes traveling with a cooler a breeze! Also doubles as a chilled pillow at the beach.
Tim C.5/5Verified
Although it looks cute it didn't arrive in time even after paying for expedited shipping so we were not able to use it on our vacation. I will probably return it which is unfortunate.
Casey P.2/5Verified
Initially I bought this for a disney trip, but now I use it for grocery trips too! Small enough when packed down and big enough to fit 2 packs of white claw!!!
Tony T.5/5Verified
Love love love this cooler! We use it basically year-round for any and all adventures. Bike rides, soccer snacks, bringing wine for a cozy dinner, camping, road trips... I keep it in my car and use it for groceries, as well. It's so convenient to pull out and use on a whim, but we've also filled it with ice and can count on it not to spill. The light blue color is beautiful and has stayed mostly clean. Several of our soccer team-mates have bought one after seeing how handy it is. Now I'm buying them for gifts so I can share the love even more.
Liz5/5
I love this cooler so much I am buying one for everyone in my family for Christmas. This is the only soft side cooler I have ever used that does not leak and it is fabulous to take on a trip where you don't have much room for extra gear!
Denise F.5/5Verified
Perfect for the golf course! I bought the Monti to take on my annual girls golf trip. Being able to hang it on the cart saved so much space!!
Denise T.5/5Verified
Definitely kept things cold but the mouth of the Mayfly was too small and I had to smoosh things to get them in, such as a small bag of fruit, a small loaf of bread. I put nine items in: a small container of milk, small bread, etc. I’m traveling overseas and this won’t work. So I gifted it … to a very happy recipient! Now I’ll have to order another because the dang this is so darn cute; light as a feather and fit into its carry bag, straps and all. The straps are also light weight btw and have air holes. Wish they’d make a back pack or carry bag like this.
Lia L.4/5Verified
high desert hike kept my drink and food nice and cold!
Amy K.5/5Verified
Purchased our Monti for travel to see our daughter and attend our first game at Mizzou. It was the perfect tailgating cooler, kept beverages super cold, never leaked and fit compactly in my backpack for the flights there and home - couldn't ask for more!
Anita N.5/5Verified
I am using our Monti Mayfly cooler bag for keeping diabetes medication at a safe temperature during travel. Easy to pack and get to for TSA at airport. We love it so much, we plan to buy another. Thank you Monti!
Carolyn P.5/5Verified
Perfect solution for a beach vacation. Packs enough for the whole family and keeps cool all day in the sun. Perfect for fishing outings as well. Light, packable, effective.
Christopher J.5/5Verified
Love it
Joellen M.5/5Verified
Really nice cooler. Blue color is nice. The size is great for a beach day. Easy to carry.
Kelly M.5/5Verified
I LOVE not having to lug a hard cooler! This light weight beauty has been my beach friend all week. I use Igloo medium sized ice packs - one on the bottom & one on the top. It keeps my day of beach drinks cool.
Elizabeth B.5/5Verified
Beach ready
Daniel C.5/5Verified
I bought this cooler as a way to have a cooler when I travel. This cooler couldn’t be more perfect! I love how it folds into itself as a small pouch and then it comes with backpack straps for easy travel. This will be my gift to travel loving friends and family!
Nancy B.5/5Verified
Road trippin!
Emily H.5/5Verified
I think I'm going to love this cooler. I also purchased the new straps to use as backpack. It's currently packed for vacation. Will be so convenient for our adventures at the beach, hiking etc.
Cathy R.5/5
what is it?
The Travel Cooler That Goes Where Bulky Coolers Can't.
The Shasta is the only packable soft cooler with durable, leak-proof materials which hold ice for up to 55 hours.
It’s 6x lighter than bulky hard coolers but carries up to 24 cans, making it perfect for travel!
The Shasta is built to survive sand, boats, flights but also grocery runs and everyday activities.
How does it work?
Smart Design That Adapts to Your Day
Simply open it up and put in your drinks, snacks, ice, cans or wine.
Wear it as a backpack to enjoy hands-free travel then compress it into itself for easy portability when done.
It’s easy to clean, fully machine-washable and naturally stain-resistant.
Why you need it
Make Every Day Out Feel Effortless
Life feels better when a big, bulky cooler isn’t holding you back.
The Shasta removes that burden, so you can experience true freedom while sharing a cold drink with friends.
Orders usually leave our warehouse within 1–2 business days. Standard U.S. shipping takes 3–5 business days, and we offer expedited options at checkout if you need it sooner.
Do you ship internationally?
Yes! We ship worldwide. International delivery times vary depending on the destination, but most orders arrive within 7–14 business days.
What's your return policy?
If you don't love your Monti cooler, return it within 30 days for a 50% refund — no hassle, no hard feelings.
What if my cooler arrives damaged or defective?
Reach out to our support team and we'll replace it right away. Every Monti product is covered against defects.
How long does Monti keep drinks cold?
Independent testing by Outdoor Life found Monti coolers held ice for up to 55 hours — on par with heavy-duty hard coolers, but at a fraction of the weight.
Is it really leakproof?
Yes. Each cooler uses a seam-welded liner that prevents leaks — even when tipped on its side.
What's the material?
The shell is made of quilted, PFAS-free nylon with reinforced stitching. It's soft, durable, and stylish enough to take anywhere.
Will condensation be a problem?
In humid environments, we recommend ice packs instead of loose ice for best results. That way you get long chill time without excess moisture.
Is it TSA or carry-on approved?
Yes — all Monti coolers fold into their built-in stuff sack and fit easily in carry-ons, backpacks, or totes. No oversized baggage fees here.
How small does it pack down?
The Shasta compresses into a 9" x 9" x 3.5" sack — smaller than a hoodie. The Mayfly packs down even smaller.
Can I fit it under an airplane seat?
Yes. Customers regularly bring Monti coolers on flights — they fit under seats and in overhead bins when packed flat.
Does it add much weight to my luggage?
Not at all. The Shasta weighs only 17 oz (about as much as a water bottle).
Is this good for hiking or camping?
Absolutely. Lightweight design and backpack straps make it perfect for trails, day hikes, or car camping trips.
Can I take it on a boat or to the beach?
Yes. Monti coolers are leak-resistant, sand-friendly, and easy to rinse clean after saltwater use.
Is it useful for parents?
Many parents use Monti coolers for park days, sports practice, or road trips — it keeps snacks and drinks cold without the bulk of a hard cooler.
Can I use it for tailgate or college events?
Yes! The Shasta holds up to 23 cans and keeps them cold all game day.
Does it works for everyday errands?
Definitely. Monti coolers double as grocery bags, lunch totes, or even as an insulated carrier for wine or flowers.
What's the difference between Shasta and Mayfly?
The Shasta (23L) is our largest cooler — it holds up to 23 cans or 5 bottles of wine, perfect for group trips. The Mayfly (14L) is smaller and lighter, ideal for day trips or solo adventures.
What about the Adventure Diaper Bag?
The Adventure Bag is designed for parents on the go. It includes an insulated bottle pouch, smart storage, and stroller hooks — combining Monti's cooling tech with parenting convenience.
How much does each cooler weigh?
Shasta: 17.2 oz. Mayfly: 14.7 oz. Both are lighter than most water bottles.
How do I pick the right size?
If you're traveling with family or groups, go with the Shasta. For solo adventures or carry-on minimalism, the Mayfly is perfect. Parents who want versatility should check out the Adventure Bag.
Can I own more than one?
Many customers do! Shasta for bigger trips, Mayfly for everyday runs, Adventure Bag for family needs.
Machine Washable + Stain Resistant
Small American Business
55-Hour Ice Retention
Quilted, PFAS-Free Nylon Shell
30-Day Refund Guarantee
90-Day Warranty
Machine Washable + Stain Resistant
Small American Business
55-Hour Ice Retention
Quilted, PFAS-Free Nylon Shell
30-Day Refund Guarantee
90-Day Warranty
Monti Coolers Size Comparison
Shasta 23L vs. Mayfly 14L
The only difference between the Shasta and Mayfly is the size of the cooler.
