I only use 3 pedals: a cry-baby wah, a Dunlop echoplex, and a tc electronics tube pilot. None of them are the "Boss" standard size, however, I can fit the 3 of them perfectly.
To be honest, I had to flip, the pedalboard, 90 degrees to fit the Wah-wah. Even though it's a bit unconventional, it's the smallest pedalboard that fits my pedals and it's extremely lightweight. I just fit it in my backup, and I'm ready for the gig.