I am livejournal illiterate and couldn't figure out how to post these for mossmorton without starting a new thread.
Si-bell on the left, Organicup on the right (both small). You can see that the Organicup is straighter in the body and more tapered at the base.
Organicup towards the front of the photo, Si-bell towards the back. You can see that the Si-bell has a slightly larger diameter.
Si-bell on the left, Organicup on the right.
For reference: from left to right, Cuplee, Si-bell, Organicup, Fleurcup, and Yuuki (soft), all are small.
I hope these are helpful!