The Iron Flask Sports Water Bottle is made of stainless steel and features double-insulated walls that can keep 32 ounces of cold liquids cool for up to 24 hours and hot liquids warm for up to 12.

INSULATED SPORTS WATER BOTTLE: Goodbye sweat! The double wall insulation makes the Iron Flask sweat-free! It keeps your drink COLD for up to 24 hours, and HOT for up to 12 hours. *NOTE: ONLY the ...

(12 hours hot / 24 hours cold) Built-In Water Filter Straw: Enjoy filtered water wherever you go. The included activated carbon water filter reduces chlorine and odor for better tasting water.

The original straw resembled a blue plastic flute but could filter up to 1,000 litres of contaminated water without the need for batteries or fuss. Since then, the technology has evolved and ...