I bought this at an Outdoor shop at a national park, where there was no choice. While it appeared well made and didn't leak after I adjusted the cap, there was some kind of black sealant inside on the weld seam. I have only put hot green tea (no sugar) in the bottle, nothing corrosive. Yet after washing it in hot water and Dawn detergent, and using a soft Bottle Brush, the sealant came off. Now the bottle has internal leaks and plain hot water will pour out brown after a couple of hours.
There apparently is no warranty on this product, and writing and emailing to many of the US distributors and the European headquarters have produced nothing in 3 months. I have replaced this with a Zojirushi SJ-SDE10 Tuff Sports Stainless Steel Vacuum Bottle (may still have wrong product image on link) and couldn't be happier. The Zojirushi keeps my tea hotter longer and has a 5 year warranty if I need it.
There are several other good reviews where folks really like the line, but it only takes me a couple of scathing experiences (especially that draw questions to material quality and construction methods) to put me off of a particular product.
It's made in CHINA. All the aluminum bottles have swiss made written on them, so I assumed that the thermos ones (steel) were too since there is nothing written on these bottles. I was looking at the box, and in small print at the bottom it says Made in China. I called the Sigg co. and they said that all their stainless steel products are made in China. They should write that on the bottles!