The Cello Instyle Vacuum Flask – 750 ml is an ISI-certified thermosteel flask from Cello — one of India's most established drinkware brands with over two decades of vacuum flask experience. Built from Grade 18/8 (304) stainless steel with Cello's proprietary Thermoseal double-wall vacuum insulation with copper coating, the Instyle keeps beverages hot or cold for up to 24 hours. At 750 ml, it holds enough for 3 to 4 standard servings of tea, coffee, or water — suitable for an office morning, a day of travel, or an outdoor outing without refilling. The Cello Instyle is one of Cello's most popular ISI-certified vacuum flasks, recognised for its Thermoseal copper-coating technology that enhances heat retention beyond standard double-wall insulation. The flip-top lid doubles as a convenient drinking cup — a practical everyday feature for tea and coffee drinkers on the move. A carry jacket is included for additional grip and insulation. The flask is ISI certified by BIS, confirming it meets Indian safety and quality standards for stainless steel vacuum flasks.
The Cello Instyle's flip-top lid that doubles as a drinking cup sets the tone for how it is used in daily life. The flip lid on the Instyle opens and closes with a single action, making it easy to use one-handed during commutes, travel, or at the office desk. The lid unscrews fully to serve as a drinking cup, so no separate cup is needed. All steel components are rust-proof, odour-free, and BPA-free, ensuring beverages taste exactly as poured with no metallic aftertaste. The double-wall vacuum eliminates exterior condensation, so the flask can be placed on documents or in a bag without causing moisture damage. Cello recommends pre-conditioning the flask with hot or cold water before first fill, and keeping it away from carbonated beverages for long-term maintenance.
ISI certification from BIS confirms the Instyle meets national safety and quality standards for vacuum flasks. Grade 18/8 stainless steel provides rust resistance, odour neutrality, and food-safe performance across years of daily use.
Cello's Thermoseal technology combines copper coating with double-wall vacuum insulation to deliver up to 24 hours of hot or cold temperature retention. The exterior remains condensation-free, preventing moisture from reaching bags and surfaces.
At 750 ml, the Instyle holds enough for 3 to 4 standard cups of tea, coffee, or water — enough for a full office morning or a day of travel without the need to find a refill point.
The flip lid that opens one-handed and doubles as a drinking cup — a design popular with office commuters and daily tea drinkers. Reduces spill risk during bag carry and active movement, making it a reliable daily companion for commuters, office workers, students, and travellers.
The flask is BPA-free throughout and comes with a thermal carry jacket for additional insulation and grip. The stainless steel body is rust-proof and does not absorb food odours, keeping beverages tasting fresh day after day.
The Cello Instyle 750 ml Vacuum Flask is available at Girdhar Das & Sons, Varanasi's trusted kitchenware store since 1970. We carry Cello's full vacuum flask range alongside flasks from Borosil, Milton, and other leading brands. All products are 100% genuine and brand-authorised. Shop at gdsons.co.in or visit us at W.H. Smith School Road, Sigra, Varanasi.