Alright I wanted to like these really bad but I am just not going to use these to travel. Gotoob is the OG silicone anti-leak travel bottle and I was excited to finally pick up some name brand bottles after I was so happy with my cheaper knock offs. I figured that these must be really nice if even the cheap ones had been good, I had planned on picking these up again when it was time to buy more travel gear. I got the small size because I already have a healthy collection of 3 ounce bottles, I needed something smaller to conserve space in my TSA 3-1-1 bag because I can't take everything I would like with me if I take 3 ounces of everything. Well, the quality of the materials is undeniable so I can't give this a bad rating, and I do think they have a slightly better seal than my cheaper bottles too. The thing is they are so bulky and inflexible I find them unusable. These "small" bottles took up almost as much space as the 3 ounce bottles I already had to hold close to half the liquid. Other bottles will kind of nestle in and squish against each other to save space, these are just stiff as a board and the excessively large opening isn't doing it any favors either. The locking mechanism would just further exacerbate that problem so I find that feature unusable. I can't recommend these to people who struggle with the TSA liquids restrictions like me, and my cheaper bottles not only pack better but they've never leaked on me anyway, plus pretty much all the silicone on the market is food safe and BPA free now too, so I didn't have to spend more in the first place. If space isn't a big deal for you, you want bottles made with thick silicone, and more substantial lid, then you may like these although you should remember that these are still much more expensive than other practically identical products too.