I have been trying to reduce my use of plastics so I thought I would try these silicone bowl covers. they do sometimes take a little patience to put on properly, but with practice it's easy, still it's so much better than disposable ones.You have to remove the backing before you use them which is no problem at all and once you do that you are good to go. They cover a variety of different container shapes and sizes and so far I haven't had to use cling film since I got them which is great! They are easy to wash and because they are clear you can easily see what is in the bowl etc. Very happy with this purchase.