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  • Flexible, food-grade silicone walls collapse, slimming the cup down to a slender 0.5 in. thick and minimizing the space it takes up in your pack
  • Rigid ring within the rim keeps it sturdy and easy to drink out of
  • When collapsed, X-Cup 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 cup 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
  • Holds 8.3 fl. oz.
  • Sea To Summit X-Cup dishwasher- and microwave-safe


View all Sea to Summit Camping Cups

REI membership


Best Use Camping
Liquid Capacity (L) 0.25 liter
Liquid Capacity (fl. oz.) 8.3 fluid ounces
Collapsible Yes
Fits In Cup Holder Yes
Material(s) Food-grade silicone/glass-reinforced nylon rim
Dimensions 3.75 x 2.75 x 2.75 inches
BPA Free Yes
Weight 1.6 ounces
Rated 2 out of 5 by from Neat idea but not durable Received as a gift and really liked how little room it took in my pack. However after only four or five trips it ripped apart at the folds so it turned out not to be very durable. Not unique to this product but for eyes over 40 the volume marks are almost impossible to read.
Date published: 2016-05-10
Rated 5 out of 5 by from Replacing Disposable Cups I bought this to carry with me while snowboarding so I could get water without using the disposable cups. It folds up and fits in my jacket nicely and hold enough water to rehydrate.
Date published: 2016-04-13
Rated 5 out of 5 by from compact, portable cup I bought this to take into venues where bottled water costs $5.00. I can carry this in a pocket or small purse and fill it up at the water fountain. The only thing that would make it better is if it also came with a lid.
Date published: 2017-04-05
Rated 5 out of 5 by from Heat Resistant - Thank you! I was a bit skeptical (of hot drinks) when I picked this up in the store. It was recommended to me, so I thought I would give it a shot. I am glad I did! This packs down compactly, but my hands weren't burned as I was drinking my piping hot morning tea.
Date published: 2017-06-07
Rated 5 out of 5 by from perfect for my hiking trips! Great cup, super compact, easy to clean and functional. It worked great on my last backpacking trip for tea or instant coffee.
Date published: 2017-05-25
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Will this hold boiling water?

Asked by: Denise H
​Yes, using boiling water is ok in the X-Cup.
Answered by: REIservice
Date published: 2017-05-01
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