HydraPak UltraFlask Speed 500ml - Collapsible Soft Flask Water Bottle for Hydration Vests and Running Packs with Easy Open Cap (500 ml/17 oz),Malibu Blue : Amazon.co.uk: Sports & Outdoors
UltraFlask IT 500ml Insulated Highly Compressible Soft Running Bottle (WITH OR WITHOUT TUBE) - Accessories from Northern Runner UK