You can buy Milton Thermosteel Flask 1000 ml with plain lid online at amazon at Rs 699 of Mrp 880, milton is well know to store hot ot cold beverages for atleast 24 hrs. Its a good product for hot tea or coffee to store for 2-5 hrs. You will get this flask at discounted price from amazon with free shipping.
Mrp Rs 880
You can also compare Milton Thermosteel Flask 1000 ml price, reviews at amazon, flipkart, snapdeal, paytm, shopclues, ebay. It is 100% rust proof & leak resistant & made of stainless steel.