I got Klean Kanteens over Sigg bottles for a couple of reasons:
- The lids to the Klean Kanteens are interchangeable. So you can start out with the sippy lid, move up to the sport top, and finally to the regular screw-on lid. I like the screw on lid because no plastic comes in contact with the liquid, but for my younger son, that's not always practical (in the car, for example). DS6 just transitioned to using the regular lid full time. When DS4 first started preschool, I was even uncomfortable with the sports lid since he had a habit of leaving his water bottles/cups lying around, but he seemed to do fine with leaving it upright. He'd probably do fine at school with the screw top now, but I'm not sure he could open it and I like for him to be as independent as possible.
- I'm not entirely comfortable with the lining that's in the Sigg containers. They say it is food safe and non-leaching, but I don't really understand what it is. I also felt like maybe it could get scratched somehow. They say it won't and I know a lot of people are very happy with them, but I just felt more comfortable with the Klean Kanteens, which are stainless steel throughout.