The bottle is 500ml which is a good size for any use. Can be used to keep hot or cold drinks in but I bought this one specifically for cold drinks.
It has a wide enough top that fits ice cubes in, it doesn't leak and is easy to clean.
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https://www.amazon.co.uk/dp/B07DVGH9PS/ref=pe_3187911_189395841_TE_dp_1