My son had the stomach flu this past week and managed to puke all over my car, however, after taking him to the ER I learned about these. I will be ordering a set for the plane and car. They are expanable, easy to seal and are relatively cheap. Cheap insurance I think.
I don't know what those cost, but anything labeled 'medical supplies' probably has a needless 300% markup, for starters on over-the-counter stuff.
After my kids outgrew diapers, I still had a full box of diaper disposal bags, similar color blue, and have deodorant. I've since kept them the my flight bag, and stuffed a few in the plane glove box. I got complacent and didn't load up my car when I switched in late 2013... paid that price last month.