-M [/quote]

The threads are spaced wider on the Guyot Bottles, yes. But the Nalgene Caps go on just fine. The Nalgene Stainless Steel bottles are made by Guyot for Nalgene. They all fit for me like a glove.

Here's a picture straight from the Guyot's own Flickr Group account showing the compatibility.

http://www.flickr.com/photos/19330304@N05/1927807338/in/pool-527246@N24/

[/quote]

OK... Went to EMS today and tried some more lids for this bottle... Bought one of the replacement wide-mouth Nalgene lids. I DID see the pic you posted, looked great to me. But then I tried again and I hate to admit it (because you seem like an upstanding guy), but my first thought was "is this guy on glue?" LOL... Anyway, here are some pics of what the result was. I don't know if they changed the thread pattern, or if I got a lemon, or what. But here you go. (I'm about to write Guyot and see what their take on it is.) Am I losing my mind or is something here amiss?