Do you have a garbage can or a bag in the car?
Try using an empty garbage bag box. It’s little bigger than a tissue box and when it fills up, you can throw away the whole box or if it’s still in shape and not wet, you can reuse it. You don’t have to buy a garbage can or one of those plastic lined garbage bag for the car. It has a wide base so it won’t tip over while car is in motion, spilling out the content. Another way of reusing what you were going to throw out anyway!
Oh, one more thingâ€¦
The beauty of these boxes are that you can fold them neatly and store them in the pantry until you need them.