The First Ascent Collapsible Cup will fit into the pockets of most running or cycling shorts, providing easy hydration at water source. Extremely lightweight with unrivalled convenience, this cup is a must-have for all trail runners and adventurers.Fits in most running and cycling short pocketsFolds completely flatRing loop for storage and carrying convenienceMade out of durable BPA-Free TPUTrail Running race regulation compliant