Osprey's Hydraulics 500mL Soft Flask is built for runners who need hydration without the bounce. A removable WingStay stabiliser holds its shape and keeps the flask sitting still in a vestpack pocket, even once it's empty. The wide 42mm opening makes loading ice or mixing in electrolytes easy, and the tapered shape slides into pockets without a fight. A high-flow, self-sealing bite valve and easy-grip twist cap simplify drinking on the move, while durable TPU construction with RF-welded seams keeps it leak-free over repeated use. Compatible with the UltraFlask Filter Cap, sold separately, for on-the-go filtration.

Features

• Removable WingStay stabiliser maintains shape and prevents bounce, even when empty.
• Large 42mm opening for quick ice and drink mix loading.
• Tapered shape for easy pocket loading.
• High-flow, self-sealing bite valve.
• Durable TPU construction with RF-welded seams.
• Easy-to-grip twist cap.
• Compatible with the UltraFlask Filter Cap (sold separately).

Specifications