I think the theory is that you keep the sippy cup and use it from race to race. That's what I'm going to do if I like it. I don't know anything about the impact of creating the cup.
Veronica
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Great idea/cool!
On 1/2 marathons I carry a fuel belt w/ my hydration anyways so I can drink when I want. This would be great for refills. I do hate the mess/waste of cups!
I hope to see this at a race near me soon!
K