Glad the trunk organizer worked out for you.

I use the Litter Chute style trash bag. The elesticized opening keeps everything from popping out. The velcro closure on the bottom is secure but allows you to empty quickly without getting a lot of junk on your hands. I hang mine over one of the seat buckle stalks between the front seats of my CR-V. Doesn't take up any floorspace that way but is easy to reach, even while driving. The only downside is that it's not really big enough for many cups, cans or bottles unless you crunch 'em down.