Product Videos

Sea to Summit X-Mug Video

Enjoy your favorite campsite beverages while saving room in your pack with the collapsible Sea To Summit X-Mug.

Sea to Summit X-Mug

Enjoy your favorite campsite beverages while saving room in your pack with the collapsible Sea To Summit X-Mug.
  • $12.95

Item # 787278

REI Members get back an estimated 10% on this item as part of their annual member refund.
Product size and color

Orders of $50 or more ship for free. Learn more

Orders of $50 or more ship for free. Learn more

  • details
  • specs
  • reviews
  • q & a
  • Flexible, food-grade silicone walls collapse, slimming the mug down to a slender 0.5 in. thick and minimizing the space it takes up in a pack
  • When collapsed, X-Mug fits snugly into the X-Bowl (sold separately) for a compact and convenient camp dining set
  • Flexible walls let you accurately pour liquid from the mug into another container; rigid, reinforced nylon ring keeps the rim sturdy for spill-free drinking
  • Internal gradient markings help you measure out the contents
  • Walls and base withstand hot liquids
  • Sea To Summit X-Mug is dishwasher safe


Sea to Summit X-Mug

Specification Description
Best use Backpacking
Liquid capacity (L) 0.47 liter
Liquid capacity (fl. oz.) 16 fluid ounces
Collapsible Yes
Material(s) Food-grade silicone/reinforced nylon rim
Dimensions 4.25 x 2.75 (collapses to 0.5) inches
BPA free Yes
Weight 2.4 ounces

Sea to Summit X-Mug

Loading Ratings & Reviews...

Rated 5out of5
by fromAwesome This is the perfect backpacking cup. It folds flat, so fits in my pot. It has a large capacity, keeps hot beverages hot and cold beverages cold. Keeps its shape when you're using it, and the rim rigid. I've used it for making muffins by placing it upside down in my pot to get the muffins out of the boiling water. It works amazingly well. My only teeny complaint is that the measurement gradations are a bit hard to read, but it only takes a couple of times when you've got the 1/4, 1/3, 1/2 and 1 cup lines down. I've become a real believer in Sea-to-Summit gear. This is another hit.
Date published: 2013-04-30
Rated 5out of5
by fromUnique concept. Well executed. This product packs small, is lightweight, and works well for hot beverages like coffee. The material allows for easy washing and seems suprisingly durable.
Date published: 2013-10-23
Rated 5out of5
by fromMulti purpose cup. I wrote a review which is posted on the GSI Coffee Filter (Java Drip), which addresses the matter of odor rentention, and how to solve "it" Read the review if you have an interest in reducing unwanted odors. Including are various uses, which can be applied to this device as well. I find this cup to be durable, and a good utility which saves space and weight. The last being of equal importance to the first aspect. But what you may not realise, is that by obtaining a small piece of tubing, you can punch a hole in the bottom (centered), and convert this cup into the perfect size ultra light coffee filter. A #2 filter trimmed to save weight will fit fine. If you do this, remove the polymer ring since it is superfluous insofar as using this cup for filtering is concerned. For ultra weight savings, cut the # 2 filter into a circle which simply fits the bottom of the cup. This works fine and filters the way it is supposed to. For water pre filtration, purchase a package of circular cotton wipes used to clean off cosmetics. This package is an eighty count. And is food grade sanitised for human use. One side has a thin linen cover which you pull off. This cover goes on the bottom of the cup over the opening(hole), on top of "it" goes the circular pad, which you cut out of the #2 filter. When both are in place (on the bottom of the cup), wet lightly and they will stay in place. You may then filter water before final filtration. This will remove small particulate. Thus avoiding the clogging of your filtration system. This method is also very good at removing aromatic oils, which are frequently infused into lesser quality coffee beans. The reason I'm writing this review, is that this cup is the perfect size for a coffee filter and pre filtration device for water. All the other aspects can be viewed as stated intially (above). I own this and use it as a cup, since I've modified a GSI coffee filter to make it light weight. So impressed am I by the size of this cup, that I further modified my GSI Java Drip by cutting off the upper silicone ring to match the size of this cup. Both work great!!! A good deal all the way around. Good work REI!!
Date published: 2012-04-17
Rated 5out of5
by fromFlat = Space-saving + lightweight Regular cups/mugs are bulky and heavy. This thing is amazing as it flattens - takes very little space and weighs just 2.1 oz. Flattened, it fits into my cook pot but expanded it's a full 2-cups large. It even has measuring-cup markings. I drink hot coffee in this and there is no plastic taste and I can hold the cup by the rim and not get burned. I love it.
Date published: 2009-04-10
Rated 5out of5
by frommulti-purpose I was looking for a small water bowl for my dog - and was lamenting the fact that travel bowls for dogs are not easily washed. So I headed over to the camping aisle and found this. It is absolutely perfect and can even be formed into a mini 'dog dish' shape. I love that it folds flat for the glove box, and can fit in my pocket for day hikes with the pooch. The best part??? It is about half the price of bowls made for dogs!
Date published: 2009-05-15
Rated 5out of5
by fromAwesome Mug! I wrote a similar review for the sea to summit bowl: I think its fantastic myself. Its lightweight and holds quite a bit of liquid. I also like that this fits into the center of the sea to summit bowl when collapsed. The two combined take up almost no room in my pack and can fit into so many places. I mostly use this over 2-4 day trips. I have not had any of the issues others have reported about smell/stain/taste with this bowl. I have been with others using this on my trips and they all love it too. With that all said, I think its a toss up between this and the guyout squishy bowl/cup which has the advantage of being .2 ounces lighter and $11 cheaper but holds significantly less than the sea to summit cup/bowl (22oz oz vs 16oz for bowl, and 16oz v 6oz). Plus the sea to summit has the convenient measuring marks in the bowl and cup. So the size plus measuring marks made the difference for me, but I don't think you're wrong with the Guyout either. It depends on your wants/needs.
Date published: 2009-08-30
Rated 5out of5
by fromTrail Baking with the Sea to Summit X-Mu I love this cup when paired with the Pinnacle Soloist for trail baking. Video test linked below.
Date published: 2010-04-25
Rated 5out of5
by fromPretty good cup/bowl I picked this up because I also have the bowl. I carry them in my backpack to work and the university along with a can of soup, beans, or whatever else I might pack for my meals. If you let water sit in the cup for about 10 minutes it will start to taste like plastic, not terrible but noticeable. I have a regular water bottle so I typically drink other liquids - tea, coffee, juice, etc. - in the cup so it works fine. I've cooked peas, instant oatmeal, and cereal in it as well. Very easy to clean. I also use the cup to fill up my water bottle if it can not fit under the spout of the fountain or the sink. It is lightweight and collapsable, fitting neatly inside the bowl. I saw that if I had bought the bowl and cup together it comes in a nice zipper carry case but it works fine without in my backpack because I keep it in a flat front zipper pocket without much space to shift around. The silicon is firm enough that it will stand by itself with any worries of tipping over or collapsing. I've used it (and the bowl) in the microwave without any i'll effects. The post below, by Packrafter, has some very cool videos about baking with the cup and I think I will be giving those a try pretty soon. Overall I get a lot of use out of the cup and am happy with my purchase. Although I mostly use it at work and school, I have brought it out on some camping trips for my friend to use because he did not have his own mess kit and it worked perfectly.
Date published: 2010-06-04

Ask a question and have it answered by REI product experts and fellow outdoor enthusiasts. Need immediate assistance? Use Live Help .

Loading Questions & Answers...