Instruction: Extract information from the supporting document to answer the given question.

Input:
Question: would anyone happen to know if standard size ceramic cups/mugs would fit in place of the plastic/paper? or be willing to measure the exact openings?
Document: I do love this, and like the way that it is made, but my plastic lids get caught in it and don't pull up smoothly. I am using Dixie Perfect Touch cups and lids, which seem to be a pretty standard size. The napkin holder will hold your standard &#34;cheap&#34; napkins, so you don't have to by expensive beverage napkins, which is very nice. I would buy again, but I do wish the lids came out easier...I'm not sure how this could be fixed.
I had very high hopes for this in my home next to my coffee pot and, while it's OK and I'm keeping it, I have a few issues with it. The 16 oz. Chinet Comfort cups I love barely fit and the lids only fit sideways. But I like it so much I'm willing to try comparable cups once these run out. I wish it held more sweetener packets or had a place for a sugar canister. I don't really need the utensil and napkin part but I'm using it for the coffee scoop and hot chocolate packets.
In a word: Wow. The coffee bar was a disaster before this contraption came along. Finally all the cups, stirrers, napkins, creamers and sugars have a designated place. Since this caddy has such a small footprint, it opens up counter space that was once wasted by sprawling supplies. It is made of good quality, tough plastic and is easy to keep clean.
We like this product but we stock it differently than shown. The compartments are just a bit too small if you do it like the picture. But you can customize it easily to your needs by storing elements wherever you want. Our stirs on the back side compartment; napkins in front side; real coffee mugs in-place of where disposable cups/lids shown; & sugar is in the drawers.Not really a good place for creamer and the top area [where straws and sugar packets shown] is not being used.
Very good for coffee station but would like drawers bigger for tea bags. Plastic looks sturdy.
I purchased this for my work kitchen because I hated how we were using plastic bins to place all the sugar packs and cream. It blends in very nicely with the coffee machine and it has a decent storage capacity. Everyone at work is very impressed. Great price too.
Finally something worthy of being on my counter next to my Keurig. I've tried so many different organizers, most are wire, or cheap plastic. This one is solid, made very well, matches my machine beautifully, and has a place for everything.I love it, highly recommend it, and rate it 5 stars.
Love everything about this product but need to purchase smaller coffee cup (12 oz or smaller). 16 oz cups fits very snug and lids do not fit at all unless you turn side ways. However,  I love it and do not have any complaints.
This fit perfect on top of a microwave next to out Keurig coffee machine. Only problem is when the cups get low it's hard to reach over the stirrers so we just keep adding cups. The pull out drawers are small so they don't hold much. It does give a very clean and organized look to the coffee area.
It is exactly what I needed to organize my coffee area in my kitchen. Very satisfied. I would definitely recomend this product to people. I like that I have a place to put my extra keurig coffee and packages of sugar.
Answer: The opening is 3 3/4 in wide snd will hold a ceramic cup.Great idea,I just put in the cardboard ones.I Love my unit and looks professional next to my Keurig coffee maker ENJOY ...luckyguyswife