Originally Posted by
rickg523
I myself often don't even use a bin on Pre, just one those little bowls, for the wallet and keys, etc. Carry-on and briefcase go directly on the belt. I see lot of people doing the same in Pre, so maybe there's just less bin use ime.
But, still, the original point of this thread is valid. You should stack your bin after you use it.
In some non-US security lines, passengers have to put everything in a bin, and use multiple bins if more than one item. I've had to use as many as four bins, but there was efficiency in staff collecting them.