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I bought these to use over Christmas when we were staying with family. As my son only has one bottle feed a day, at bedtime, it made more sense to use disposable bottles and cartons of formula rather than having to go through the hassle of sterilising a bottle every day. The bottles hold 250ml (which is handy as formula cartons are 200ml or 250ml) and come in packs of 5 or 10. The 10-pack costs £5.49 and the 4-pack is £2.99. They are recyclable and BPA-free. They are available from Boots, Mothercare, most supermarkets and from the Tommee Tippee website. The bottles are packaged in a similar way to a stack of plastic cups, in a single wrapper. From reading other reviews, I gather that they used to be packaged individually which was considered better, as now they have to be used within a week once you open the packet. I'm sure that you could still sterilise them with cold water tablets and they would be fine, after all, they have not been used for milk so the danger of bacteria build-up has to be pretty small. They are simple enough to use, put milk in bottle, put top on, feed baby. You do have to make sure the top clicks on properly as it is push-on, not screw-on. One word of warning - check whether you are buying medium- or fast-flow bottles, as they both say they are suitable from 3 months. With regular TT bottles, the fast flow teats aren't suitable until 6 months, so I am not sure why these are different. I bought the fast-flow without realising and gave my baby a bit of a surprise! But he got used to it quite quickly! I was pleased with these bottles, but then I was only using one a day. If your baby is on five bottle feeds a day, it would be a costly way of feeding, for example, if you were going on holiday. But for occasional use, they are a good, hassle-free way of feeding your baby.