Aonijie 500ml softflask compresses as you drink to eliminate water sloshing around.  Pull bite valve.

Durable Thermoplastic Polyurethane (TPU) construction

BPA, PVC and Phthalate free, will not taint taste;
Hydration vest compatible: fits easily in most hydration vest, belt or pack pockets. Soft material conforms to any pocket for a comfortable carrying.

Reliable cost effective hydration option from Aonijie