There are multiple qualities about this bottle that can be considered good or bad. Pros: 1.I like silicone bottles. They don't get permanently deformed over time from being squeezed like hard plastic and I feel more compelled to clean and reuse them for travel instead of being lazy and throw them out 2. They look nice 3. When you unscrew the clear plastic lid, it has a very wide mouth opening. This is great for filling and cleaning out. You could probably even invert the bottle if you wanted to try. 4. It seems like it won't leak in terms of real functionality, but I can elaborate at the end of the review Potential Cons / Actual Cons 1. It's a little unintuitive, but it's probably best to hold the bottle by the hard white plastic rim when opening the pop top. Constantly pulling on the silicone part probably isn't good for the lifespan of the bottle. This means you're probably going to need to use two hands most of the time, since the lid is decently strong (someone with weak hands might not be able to open it with one hand without pulling on the silicone). 2. The main way this bottle seems to prevent leaking from bottle to the clear cap is through a silicone "x" cut in the squeeze hole. This will do a great job trapping liquid in, but it also means it is very hard to get any air into the bottle. Through testing, I found that a squeezed bottle will stay "deformed" temporarily if it is empty (no liquid), and for a long time or permanently if it is filled (the liquid probably forms an even stronger seal). I think this might be why some people in the reviews have trouble with the bottle deforming randomly — I'd guess that the contents of the bottle changed in pressure (for whatever reason). It's easy to re-inflate a partially-filled bottle by very briefly unscrewing the clear plastic top for a second to let air in. I think it'd probably be a better idea to follow traditional leak-prevention methods with hard caps like we see on most squeeze-tube toiletries, rather than using the silicone x slit. The x-slit is probably great (maybe even necessary) for low-viscosity liquids, but unnecessary for most typical toiletries which aren't super watery. With that said, Some people may be interested in removing the x-slit entirely to reduce the pressure issues. I won't explicitly recommend this, but I did a bit of testing on leakage. When I filled the bottle and left it diagonally upside down, nothing leaked out under the white plastic, it only ever leaked between the clear top and the white plastic rim. In one of my images, I numbered the "rings" on the lid top, 1-4, the 4 being a tiny little ring in the center (seems to do nothing), 3 being a ring that corresponds with the squeeze hole (sits inside the rim on the bottle-side) 2 sitting outside the squeeze hole, and 1 being the actual cap rim. IF liquid were to leak out of the bottle, it doesn't seem like it can escape from being contained within the 3rd ring. Liquid that manages to get into the 2nd ring, however, WILL READILY LEAK. I don't see this happening often (especially not at all if you don't modify the x-slit to a simple hole), but it's good to know. Given that the liquid seemingly does not escape from the 3rd ring (I squeezed liquid into this ring, then held the bottle at a diagonal for an hour at least — did the same for the 2nd), it may be worthwhile to simply cut out the x-slit and see if it improves functionality. I am still debating doing this myself. I tested with my face wash, which isn't watery (just like the rest of my toiletries).