Well, read my reviews.
I can take all of the Doc Johnson that John Doe posted above as well as the pink 16 inch double dong. Also, Mistress Tracy of Dallas has an 18 inch clear gel double dong that is a little bit thicker than a large man's thumb. I can make that disappear too.
In terms of thickness, I can take a Tracy's fist almost to the elbow. I can take a double fist, and I can take a size 9 foot also. Mistress Tracy and Mistress Iris of LA double fisted me together and held hands inside me.
Since, I think I won this thread.