From the Bog Dog team:
The OMM Ultra Flexi Cup is the no-fuss, ultra-light hydration solution for races and training. Mandatory kit for many events, this collapsible cup is made from flexible TPU and weighs just 10g — perfect for on-the-go hydration at aid stations without adding bulk.
Its soft construction allows it to fold flat when not in use, and it’s durable enough for repeated use over long distances and rough terrain.
Key Features:
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Soft, collapsible TPU design
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Ultra-lightweight (just 10g)
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BPA-free and reusable
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200ml capacity
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Race-compliant mandatory kit