Sonashi brand double-wall insulated vacuum flask. In these types of double-wall insulated steel flasks:
Hot water or drinks: Stays quite hot for about 12 to 18 hours.
Cold water or drinks: Can keep cold for up to 24 hours.
The flask has been used only once or twice and is like brand new. It was purchased for taka. Price is fixed, only interested buyers contact, do not call for bargaining, thank you.