Exllena Metal Water Bottles With Water Bottle Buckle, Double Wall Vacuum Insulated Water Bottles 12 Hrs Hot24 Hrs Cold, 1L Stainless Steel Water Bottle Bpa Free For Gym, Camping, Hiking (Black)Double-wall insulation: The insulated water bottle benefits from double-wall vacuum insulation - which keeps cold drinks cold for up to 24 hours and hot drin..