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If I just get a cup from Starbucks or wherever, ALWAYS get the little plug thing. Our rides are so stiff and bumpy...always have liquids finding their way out. I'll have a spare napkin and and kinda wedge it around the cup and the retractable cover there...keeps the cup from moving. I never get bigger than the grande. Usually tall.
I have one insulated mug that fits pretty snug tho...
Another idea is to buy some small furniture pads from the hardware store. Works for me using a variety of mugs and cups. If you don't like the white edges or brown material, blacken them with a Sharpie before installing in the car, although you don't see them when the mug is in place or the lid is closed. BTW, this was Foosh's idea posted in an earlier thread.
There's two other benefits to using the cup koozie. You can flip it over and put it on the shift ****, so it doesn't get so damn hot while the car is parked outside all day. I keep it in the center console so my phone can sit on it while it's connected to the USB socket.
Coffee mug solution
