You can always drop the lanyard under your shirt, which is what we do. That way it doesn't fly around on coasters.
Be REALLY careful of putting passes in back pockets. On two separate occasions I have seen people's passes work their way out of back pockets when they were sitting on the ground watching entertainment in the parks. Passes that have gotten badly bent will sometimes not scan well.
Also, be careful if you have the tyvek "paper" passes; if they get wet, or even damp, they get too floppy to scan. DH had this happen to a pass that was inside his wallet; he was sweating so much that his clothing got wet, and the contents of his wallet ended up damp. (Moisture doesn't ruin the strip, and they will work again if they dry out flat, but who wants to wait that long for a FP?)