Small bike bag

I'll be taking my bike on a road trip soon, and am looking for a small bag to fit it in. I can fit the bike in the back of my car standing up with wheels off / saddle down, with a few inches to spare on either side. I'm looking for a bag that will neatly wrap snuggly around the frame so I don't have to worry about chain grease getting everywhere, and also so the bike isn't immediately visible to passersby when parked for lunch etc.
Can anyone recommend something?
Can anyone recommend something?
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I had it wheels out upside down in the rear foot wells, saddle at one side bars at the other. Excess material of the bag just folded out of the way.
Stretchy, so it also works as a wheels-on cover if you need to bring a wet bike into the house. Packs very small.