Love them. Stays cosy for a good 4 to 5 hours," said another. "I have a rechargeable hot water bottle and it's fab, stays hot for hours," said a third. One heat saver believes he can make the ...

Scrunching it up and changing the bottle’s size is a fun experience ... with water when they’re folded up, but when you expand them the bottles grow to a decent size and can fit a respectable ...