The SOFT FLASK 500ml/17oz STRAW 28 fits perfectly with ADVANCED SKIN 8 for women and has been developed to reduce pressure on the chest, while the adjustable suction tube and a high-flow valve make it easier to drink properly. The bottle compresses as you drink, which reduces noise and lets you always know exactly how much is left. Compatible with all Salomon lids with an aperture of 28 mm.