Round,BPA-Free, Freezer Safe, Plastic, Grey
From Amazon
HydraPak SkyFlask IT Speed 300ml - Insulated Collapsible Handheld Running Water Bottle Soft Flask - (300 ml/10 oz) - Adjustable Handstrap, Spill-Proof Cap, Silver
Trekkinn
Hydrapak Skyflask Speed 350ml Blue