Does anyone have a favorite brand of rain cover that will fit an E-trac? I've seen several different ones on E-bay with a variety of prices. There's one that is a set of three pieces for the battery and grip also. Others are just for the display. Can you change settings easily or do you need to pull the cover loose each time? One seller has one where you can slide your thumb underneath to operate the buttons.....does that design work well or can you just poke them through the clear plastic?