It's a water bottle.

• 650 ml Purist waterbottle
• Soft LDPE body is easy to squeeze and BPA-free
• Thin silicone coating prevents staining or tastes to keep your water pure and bottle clean.
• High-flow Heart Valve is leakproof, even when the valve is open.
• Fits most standard bottle cages.

To clean: shake with soapy water. Do not scrub – this could damage the silicone layer.