
I travel a lot for work and my wife and I travel everywhere on a regular basis. These silicone bottles are the best travel bottles I have ever used. Typically, travel bottles either leak immediately or begin to leak after a short period of use and eventually become so deformed that they no longer hold up. The rubber part fits directly onto the cap, so there are only three parts: chamber, neck and cap. Good design. You can make filling the bottles easier by placing the mixture in a Ziploc bag with the corner cut off, or using a piping bag with a metal tip to squeeze the mixture into the bottle. This brand was significantly cheaper than GoToo and the same great quality. I used them on my recent work trip and had no issues with leaks, TSA or different products when needed.

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