The Borosil Bolt Vacuum Flask 500ml is a compact, everyday water bottle built from 100% food-grade, rust-proof 18/8 stainless steel (Grade 304) inside and out. Its double-wall vacuum insulation with copper coating keeps drinks hot for several hours and cold for even longer, making it a handy companion for the office, gym, school or daily commute. The screw-type lid is leak-proof and drip-free, and the bottle's condensation-free exterior keeps your hands and bag dry even when carrying ice-cold water. A wide mouth opening makes it easy to add ice cubes or clean the bottle thoroughly, and its compact 500ml size fits comfortably in most bags and cup holders. Backed by a 1-year warranty against manufacturing defects, the Bolt 500 is a durable, practical choice for everyday hot-and-cold hydration. The Borosil Bolt Vacuum Flask 500 is available at Girdhar Das & Sons, Varanasi.