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Now you can stop drinking coffee out of water bottles.

From morning coffee to afternoon happy hour, the Sea To Summit X-Mug pops up to hold your favorite beverage, then folds flat for easy storage. This convenient mug features an accordion-style design and food-grade silicon sides, as well as a sturdy nylon top ring to maintain shape.

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Sea To Summit X-Mug Collapsible Mug

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Here's what others have to say...

4 5

Tastes like barbie dolls

  • Familiarity: I've used it several times

Taking off 1 star from an otherwise incomparable collapsing mug. Silicon will always hold onto oils and is very difficult to get clean in the backcountry. I discovered this somewhere in the Cascades, with a cup of Willamette pinot smelling powerfully of bacon, coffeee and Dr. Bronner's Lavender Magic Soap. This cup had been thoroughly cleaned - the essential oils from the soap and other foods had attached to the silicon. The smell only went away when boiling the cup in clean water an oily white residue collected on top of the water.

Lesson learned: don't use scented magic soap.

I have the X Shot glass I wanted for mixing drinks in camp. It does retain a little smell but a good kind in my case. But after having a few shots from the glass, I am compelled to say; "VY.P please, please stop licking your Barbie Doll.

5 5

Awesome Cup

  • Familiarity: I've put it through the wringer

Great cup for backpacking & traveling with. Love that it collapses so I didn't have to take up valuable pack space or hang it outside my pack. Worked well for cocktails & coffee! The silicone tends to collect some dirt but I could use the extra minerals. Cheers!

5 5

the only dish you need for backpacking

  • Familiarity: I've used it several times

I carried this for backpacking 4 nights in the Smokies. It worked great! It was durable and just the right size and shape for meals and drinks, so you don't need a separate cup and bowl. It collapses really well, and is extremely handy.

2 5

Breaks easily

This cup withstodd over 1 use! I drank coffee with it in the morning, then stowed it collapsed. Upon extending it in the evening for a beer, the ring and upper portion split. Hopefully Sea to Summit cistomer service has me covered.

Breaks easily


Spoke with Sea to Summit customer service, they are replacing it. Still question the durability.

4 5


  • Familiarity: I've used it several times

This is an great cup. You can actually hold it with hot coffee/tea. I like that it is not hard plastic. It might be harder to clean than plastic but not hard enough to not use again. I was afraid of being able to taste the silicone, but that worry was laid to rest the first time I drank my morning java. I would recommend this cup to anyone.

4 5

Light and compact

  • Familiarity: I've used it several times

Thanks to other reviews, I found out that the cup ran small, and ordered the mug instead. Even so, the mug itself is none too huge. I love its portability and lightness. However, in a dusty campsite, I found that the dirt clung more easily to the silicone than to other hard plastic collapsible models. I will still continue to use and enjoy.

5 5

useful backpacking kitchen addition

  • Familiarity: I've put it through the wringer

Love this little guy. Always looking to save on weight and space; this fits the bill.

4 5

Sweet Mug

  • Familiarity: I've used it several times

This mug is great for camping and backpacking, it's lightweight and super easy to store. I use them for tailgating too, it's a sweet gadget to show your buddies and it can hold coffee to keep you warm! I even use it to eat my cereal in the morning when I go camping. They are also SUPER easy to clean, which is great in my book.

Size compared to my hand

Size compared to my hand

Thanks to your photos I am going to invest in one of these nifty little cups. I own the shot glass which is nice and I have used ti for years but I can see the advantages in having this in your pocket in certain situations. Thanks

5 5

Light and Versatile

Extremely packable and simple to use. A friend recommended it for lightweight backpacking who also enjoys gourmet cooking. Found out you can nest it on top of a JetBoil (put some water in Jetboil first) and use it as a double-boiler to make backcountry fondue!

Fantastic idea as I like to pour melted chocolate over some dessert cakes and trying to melt it in a JetBoil is a treacherous proposition. Thanks for the idea. A double boiler in the field...fabulous idea.

5 5

Best Purchase Almost Ever!

  • Familiarity: I've put it through the wringer

Compact, tough and easy to clean. I wouldn't use them for backpacking because they aren't the lightest, but they are awesome for car camping. Great buy!

nicely sized cup

nicely sized cup

Just used these rafting the middlefork of the salmon, and always kept one handy in my jacket pocket for whatever the beverage dujour might be, and one in the cooler for anyone who might swim up to the bar. A must have for any excursion.

4 5

Nice Mug

I like this mug. It's compact and nests with the bowl. There is a plastic taste to the semi rigid ring around the lip of the mug. And the silicone is thin, so hot drinks have to be held by the ring around the lip or with a rag. But overall I like this mug.

5 5

One of my favorite pieces of gear

I love these things. I have 3. They are great for coffee in the morning and also as a bowl for my dinner at night. Extremely easy to clean/wipe down too. When I'm backpacking this gets used every day at breakfast and at dinner. No, it doesnt have a handle, but I must say, holding a piping hot silicone cup of coffee in your bare hands on a 20 degree morning feels damn good!

Can you microwave your tea/coffee in this...

Can you microwave your tea/coffee in this in your motel room the night before you leave on the trail?

oops -- just saw this had already been answered 5/26/11 -- and the answer's YES!!! Thanks, Phil Maher -- you're great for providing so many answers for all of us! :)

what is the diameter of the mug when you...

what is the diameter of the mug when you collapse it?

Sam--The diameter is just under 4.5 inches collapsed, and the mug stands 3.5 inches high when expanded.

Is this offered as a set of four, or do...

Is this offered as a set of four, or do you pay $11.90 per mug? The reason I ask is because the photo shows four colors, but the options gives you indicates that there is only "One Color." I thought maybe that's because these are sold as a set. Otherwise, you don't have a choice in color?

Best Answer

Nope, just one at a time. Typically the warehouse guys will just pull whatever color comes up first, but I've sometimes placed an order by phone and requested something specific. They try their best, but it doesn't always happen. As for the "one color"- it could be that one or the other is all they have in stock, or that it's the grab bag. In either case, worth a quick call to clarify.

Thanks for the helpful response. Not too concerned with the color choice, but I do need to order more than one mug.

I love the X-Mug but mine has developed a...

I love the X-Mug but mine has developed a small hole at one of the folds, so now it leaks. (No idea how it happened.) Any suggestions on how to repair it? Nothing seem to stick to the silicone. Or could it still be under warranty? There's no warranty info on the Sea to Summit website.

You can try and contact Sea To Summit directly, or if you purchased from Back Country, they have a 100% return policy...

Best Answer

Yeah, call STS @ 303-440-8977. Ask them to replace it under warranty, since it's lifetime. The fact that it developed a hole directly on one of the folds is easily a matter of making the argument that it was due to material failure. Or, as Dean said, if you bought it here, BC will replace it unconditionally as well, maybe even faster.

Thanks for the info Phil & Dean. I'll see if the retailer I purchased it from (not BC as I didn't know about you guys then) will take it back under warranty. The failure may have been due a thin spot that was there since day one. I would buy one again though.

Is there a difference between the X Cup...

Is there a difference between the X Cup and the X Mug? Volume and weight are listed as the same.

Maybe there is a mistake in the specifications but as far as i know is that the Xcup has a capacity of 250ml (1cup) wile the Xmug is 480 ml (almost 2 cups).

Best Answer

The x-mug has a 16oz (480ml) capacity and weighs 2.7 oz. The x-cup has an 8.3oz (250ml) capacity and weighs 1.6oz. The cup and the mug are also calibrated and have graduations on the side in both fractions of a cup and ml.