When my dad's admitted into the hospital - SGH - I was asked to buy thermos for him. This is when I learnt of the tip from my mum, the tip to buy a thermos which can hold the heat better.
It's very simple! Just hold the opening or so-called the "mouth" of the thermos to your ear and listen to the sound produced. If you hear loud sound, then it's an OK. ;)
Another thing I learnt is: Don't buy plastic thermos! If you want to enjoy longer life, then buy those other than plastic. Unless you wanted to shorten your lifespan by taking in the melted resin (when the hot water will flow through the plastic opening). *I bought a plastic thermos actually TT
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| the thermos which I bought |
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| closer look at the opening |
o......now i know... ^^
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