Puritan Board Junior
And what about the common loaf.
The best way to serve the bread that I have seen is to choose a soft loaf and cut slices at right angles to each other about an inch to an inch and a half down. It is easy to brake off a substantial morsel/mouthful as the one loaf signifying the one body is passed round.
It is much better than these - often minuscule - pre-cut squares or crutons that we are often presented with. I try not to let these kind of things diminish my enjoyment of the Sacrament.
I'll guarantee that the original was a wafer of unleavened bread that would have been at the passover. While the context is different, 1 co 5:8 could be read to require unleavened bread.
Ultimately this is a question of circumstance or of essence. And while I don't believe it is essence, I certainly wouldn't object to a common cup (or leavened bread).