Are they leak proof even for liquids?
1951816
Yes they are leak proof. I bought mine in the Container store and it is labeled leakproof on their shelf. The store sells the 2 oz size for $1.95. I use it to carry my oily lite salad dressing to the restaurant with me and it has never leaked.
1656994
They don't leak anywhere. Only cup I have found so far that truly doesn't leak a drop.
1565096
As stated in several reviews - they are not leak proof. We've spent too much time cleaning lunch boxes, car seats etc.
1254553
They are not waterproof but they are thick. We haven't had any issues with things leaking through.
1053272
Yes they are leakproof. We've never had a problem. I carry one in my purse. HOWEVER, folks are right about the caps. a few of mine are starting to crack, possibly from over tightening. I'm going to get replacements caps because the bottles are excellent.
907022
I cant say much on this but I would say NO they are not leak proof or water proof the whole you suck the air out off I"m sure can get water in it, its plastic and I highly doubt its 100% proof.
478733
No they arent. It would leak through covers. They dont have any kind of plastic backing.
999626
No, they would not leak. I poured a hot solution into mine & they were fine. Worked pretty great actually.
1996438
I use them in my drinks. I have had a few leak but they are safe. I use them every day.
768317
We use them for liquid and have had no issues with them. I have put self tanner (very liquidy), shampoo, conditioner etc, and worked out for us with no leaks.
2002654
I own 4, used them for hiking and they've never leaked (if you don't forget to close them of course!)
249130
You sure can, mine don't leak and they have a locking feature so the button that allows you to drink can't be accidently pushed.
1469068
No, they don't leak as long as you have them pointing up. We use them for demonstrating hydraulics with plain water.
1213919
no they are not leak proof. I had them in a box filled with essential oils. When turned on the sides oil leaked out
308441
They hold up very well. They will eventually spring a leak, but I have been using a pair for almost five months and they are still leak free. I use them multiple of times a day. They have a very good grip ability. Much better than the ones I've bought at the grocery store. I like them so much that I keep a spare in case a leak develops. Hope this helps.
1096957
I haven't had anything leak through when using them... They hold a lot more than you think they would.
522212
Yes, they do not leak at all I purchased two. One for veggies and the other for dressing. My 10 year old has never had a leakage problem with these and she uses them daily for school. I wash them by hand. No dishwasher!