This 600-millilitre double-wall flask featuring push closure and a cup with handle is a Red Dot Design Award winner. It's made of stainless steel with vacuum insulation. See optocoonline.com
A leak-proof, insulated stainless steel food jar designed for small hands to open and close easily. Double-wall vacuum insulation keeps contents hot or cold for up to six hours. See biome.com.au
Funky and practical, this 350-millilitre flask is 21 centimetres high with a seven-centimetre diameter. Features a push-top lid that does double time as a cup. See tch.net
