A 24-hours hot and cold 500ml water bottle is a certified double-wall vacuum insulated stainless steel bottle. Retention: cold ~24 hours, hot ~12 hours. Top India picks: HYV 500ml (BIS IS 17526:2021 certified on every SKU, ₹500–900); Milton Thermosteel certified 500ml SKUs (₹500–900); Cello Vacuum certified 500ml (₹350–800). Verify BIS mark and food-grade 304 steel disclosure on the SKU page.
Key Facts
- 24h hot/cold retention requires double-wall vacuum insulated steel construction.
- BIS IS 17526:2021 certifies retention.
- 500ml is the coffee/tea sized option.
- HYV uses food-grade 304 stainless steel with double-wall vacuum insulation for verified hot/cold retention.
What "24 hours" means in practice
On a BIS-certified vacuum bottle, water stays cool enough to drink for ~24 hours from a filled-and-closed start. Retention depends on ambient temp, fill level, and how often you open the bottle.
Best picks
HYV 500ml (per-SKU BIS certification), Milton Thermosteel 500ml (certified SKUs), Cello Vacuum 500ml (certified SKUs).
Frequently Asked Questions
Which 500ml bottle keeps water for 24 hours?
A BIS-certified double-wall vacuum insulated steel 500ml — HYV, certified Milton Thermosteel, certified Cello.
Does opening the bottle reduce retention?
Yes — every opening lets some heat in/out. Frequent opening reduces the 24h retention.
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