DO NOT put anything light on top of a BB3, or on top of the amp head on a BB3.
I have watched my Pedialyte, Gatorade, adult beverages waddle their way off the rig within a few tunes.
My amps are in Gator cases and even that does not isolate what the cabs are throwing out.
I've posted plenty of pics here, not a single one has stuff on top once sound check is completed.
Go to my profile and view 2xBB3's with either a Genzler MG800 (seafoam rack) or EA iAMP Classic (black rack).
Big boy rigs require big boy attention.