The Silicone Spill-Proof Set includes 6 pieces, ideal for both kitchen and home use. Features leak-proof straw caps and spill stoppers for added convenience.

perfectly fitted for original stanley. %95 leakage proof. i couldnt carry it in my bag before i bought that but now i can carry it without any leak !

Good little items but you have to have the proper Stanley straws which are slightly wider than normal straws., my daugther loves them when she knocks her bottle over on her new carpet.

Very practical to help seal your cup, but the lid of the straw is big in mine but maybe with another straw it will be more adjusted, I recommend it