I am happy to report that the Guyot Designs STD style bottles not only are compatible with standard nalgene tops (if you ever need a spare), they fit the OR bottle jackets (as mentioned above) and they DO fit the Olicamp Space Saver Cups! I can fit my normal bottle and cup inside the OR bottle jackets.

The fit on the space saver cups is pretty tight. I'd like to see another mm or two shaved. However, they fit fine like they are!

I wish I'd bought these bottles some time back when I first saw them mentioned. But from the pictures, I wasn't convinced the size would have been right. I'm happy to report they are compatible with everything I've tried thus far.

And Falcon500...I don't know what you did to dent one of these! They seem bomb-proof