Surprised to read the negative comments about these lidded plastic basins. I have used these particular items from Lakelands for 2 years now without any problems. I have never had a lid come off, but think it's essential not to put too much raw mixture in each container and to allow enough room for expansion as they cook. The lids click on nice and securely and the plastic is sturdy and robust. I had some before from another source and they tended to warp and melt if you weren't careful. I use the smallest size for individual Christmas puddings which, because they are so rich, my family find big enough for one portion, but am now buying the larger size for chocolate steamed or treacle sponge puddings. Damn the calories.