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Sea to Summit X-Cup

photo: Sea to Summit X-Cup cup/mug


Price Current Retail: $8.36-$37.50
Historic Range: $6.95-$52.50
Reviewers Paid: $11.99
Weight 1.6 oz / 45 g
Volume 8.3 fl oz / 250 ml
Diameter 3.75 in / 9.5 cm
Height 2.75 in / 7 cm


1 review
5-star:   0
4-star:   1
3-star:   0
2-star:   0
1-star:   0

Lightweight, convenient, and seemingly durable for hot or cold beverages at camp or on a backpacking trip.


  • Collapsible (size)
  • Lightweight
  • Usable for hot/cold beverages


  • Stability (see below for detail)

The Sea To Summit X-Cup is a good choice for backpacking or camping if you want a compact, lightweight cup for hot and/or cold beverages. I primarily use mine for coffee or the occasional Crystal Light (or other mix-in water additive). It's nice to have this on hand if i want to drink something besides water but prefer not to make my entire water supply taste like kool-aid. I find the 8.3oz volume a good size for these purposes, especially for the weight.

I keep my X-Cup in the top of my cook pot where it sits (collapsed) on top of my stove and fuel canister (all of which is in a mesh bag). It's ridden over 100 miles fine that way without an issue. It also hasn't given me any indication that collapsible silicon areas are going to crack or break, resulting in leakage.

Every time I consider my cook set and possibly switching things up a bit, I check the weight on this cup (my scale says 1.58oz) versus using a titanium cup/lid setup and it seems to be a wash in terms of weight. One benefit to switching to a titanium cup might be that the measurement marks may have more benefit; the X-cup has graduated marks inside, but at just over 8oz total volume, there's not much i would measure. For me and my uses, that's not a problem but it's something noteworthy.

If you need a size upgrade, the X-Mug is similar and holds 16oz (but is a little heavier of course).

One last comment before you decide to buy the X-Cup is that the base is smaller than the mouth of the cup and is also silicone, so sitting this down does need to be a conscious act if you want to avoid a spill. Although almost any cup needs a flat surface to avoid a spill, this one is slightly more picky because the base is more narrow.

As you can see in the picture, I was able to set it on a questionably flat log next to Justus Creek on the A.T. in Georgia, so it gets the job done in my experience.

Source: bought it new
Price Paid: $11.99


My x-cup has gradient marks.

4 years ago
Joshua Johnson

Oh, nice! Thanks pillowthread! ... I'll update the post.

4 years ago

Thanks for the review, Joshua!

4 years ago

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