I first purchased one of these for my older daughter in Germany. It's five years old and still looks great. My younger daughter loved hers - I purchased the twist top attachment (she's too young for a sport bottle top) and she drinks from the open bottle more easily than a cup. Perfect size for little mouths.

I was concerned that these are not meant for the dishwasher, and I was skeptical of the claim that they only needed rinsing. It's absolutely true. I bought some special cleaning tabs and I've used them only a few times - always when traveling and some sort of juice has been forgotten for days. (It's so easy to clean them out this way - warm water plus cleaning tab, 30 minutes later it's brand new inside) Great for lunches or backpacks, no glass to shatter or plastic lining to transfer taste. Can't live without them now. 5 stars

After lots of research, I purchased my kids each a Sigg cup and a Klean Kanteen. While I like the LOOK of the Sigg cup better, I am so disappointed with the cup's performance. We haven't had these cups more than a couple of months and all ready there are dents and chipping paint. I know it has this "leach-proof liner," but I wonder how well it works when the cup is dented. My son's cup I can't even give him, as he is only 1 and I worry that he'll bite it and injest some of the chipping paint. I am so shocked that these cups get such great ratings. While I'd definitely buy another Klean Kanteen, I would never, ever buy a Sigg again, especially not for a young child. My daughter is older and more careful with hers, but even hers has a couple of spots where the paint is starting to wear. She does love her cup, a 20oz Sigg and will be so disappointed when I wind up tossing it. Sigg cups are so expensive. I expected that it would last for years, not merely a couple of months. 1 star

I bought one of these to try for my 18-month-old since it's made of aluminum and it says it is leak proof. However, the lid, when open, spills everywhere. It is fine for drinking water outside, but he spills it everywhere in the car. I intended to use them for milk, but since they leak, we have only used them for water. Another thing, my son who can open plastic water bottles, cannot open the lid himself so that makes him frustrated. I love the idea but will wait to buy more when he is older. Plus, it is expensive. Why can't anyone make a perfect non-leaking, better-for-baby sippy cup!? 2 stars

I purchased one of these in each size for each of my 3 children, and while the product met my expectations quality wise, this is not a great item for a baby or toddler. My youngest is 15 months, has no problems holding the bottle or drinking from it, I would recommend if you are buying this to get a pouch, as when filled with cold liquids the container itself is very cold to hold. She really likes the bottle and the only reason I won't buy her another until she is older is that the flow from the mouth piece is fast and very "airy" she is swallowing as much air as she is liquids, causing her to "choke" on it a lot. I like the fact that with the lid on and cap closed this bottle is spill proof, and even when left open and on its side very little liquid will leak out. Overall this is a great product, but more for kids who are a little older. (3 or so) 4 stars

These leak proof, durable, fun, easy to clean bottles replaces the sippy cup and lasts forever! They are more expensive, but they cannot even be compared to plastic bottles or cups.

When traveling, it is not always easy to clean sippy cups - this one only needs to be rinsed with hot water. Great for kids who want to be independent but still need the protection of the "sippy cup" concept. The loop for the screw on cap allows easy attachment onto luggage or a carabiner. Many designs to choose from, for kids and adults too!

Sigg Switzerland Aluminum Bottles are a "JetWithKids" recommended product! 5 stars