UltraSpire C2 Race Cup Luminous Tumbler, Unisex Adult, Blue, M

I carry this with me for trail races to use at aid stations. It's flexible so that it easily packs into one of the pockets in my hydration vest. It's got a nice soft silicone feel so it's not rigid or stiff and yet it hold its shape well for drinking. I like that it's clearish so you can see how much liquid is inside. So much better than a single use plastic cup that is thrown away and not reusable. Great for anyone to carry at any time!

So many race are now (thankfully) cupless events. If you don't have a cup, maybe you can pour your electrolyte drink into your cupped hands, but that's kind of gross and sticky, and this cup solves that problem easily. They crush up nicely into a pocket, and pop back into shape instantly to fill with water or your favorite race beverage. I'll never run another ultra without this cup.

Hopefully more and more races will require these, or really require a runner to carry anything small and collapsible to convey fluids. This one works pretty, is lightweight, doesn't take up much space when folded flat. HydraFlask / Salomon sell one that is even thinner/lighter but for whatever reason it's harder to come by and holds even less fluid. All in all pretty well made, by virtue of being flexible silicone it can be hard to drink out of but I think this is generally a trade off needed to make this so portable.

Perfect for cupless ultra races. I was able to fold this down really small and stash it in a small pocket on my hydration pack. I didn't notice any extra bulk!

Works great for my cup less marathon race. No problem stuffing it into my tiny running tights pocket.