OK I have two quotes from two different people...

"...The Guyoets use the same size and thread as the wide mouth Nalgenes, which works well for me with my other stuff for the Nalgenes..."


"...you can take the super light plastic caps off of any wide mouth bottles (Nalgene..etc) that you own and put them onto the Guyot..."

Problem is: bought the 40oz Standard Guyot bottle and tried another lid from the wide mouth Nalgenes on display next to it, and lo and behold it doth not fit. Threads on the steel bottle are slightly different from the ones on the plastic Nalgenes. Still a great bottle, but would be nice to switch to a smaller lid... Any thoughts, or am I out of my mind and I should have tried a couple more lids with it...?

-M