Hi! I'm really just getting my feet wet in a lot of things, but I have been making aroma bead sachets for a bit and testing them here in the heat of our summer. I tried the jars with the daisy lids here in the house and they didn't get enough air flow in my opinion so I can only smell them when up close. I also noticed that with the organza bags, if I went with the lighter color bags the beads tended to "melt" less that with dark bags. If the beads cure properly I wouldn't worry too much about hanging bags leaking, but I'm not sure about under the seat. Just my 2 cents. Good luck and be careful because buying the oils can be addictive!