These breathable leather or sheepskin pouches allow you to use essential oil(s) of your choice to make any area smell nice. They can be used in vehicles, closets, RV’s. You can stick them inside shoes, totes, or really anywhere you want!

You will have to choose a material and oil(s) you want to use with the pouch. 

I myself use quilted cotton round pads cause it’s a natural material that diffuses the oils scent well and it’s easy to just change them out with new combinations of essential oils. From what I’ve researched you should be able to safely use other natural fabrics like wool, linen or flannel.
Use caution when using them close to things that could be damaged by contact with essential oils. 
But with the cotton rounds I haven’t had any issues so far as I usually stick to no more then ten drops of oil and then put an extra pad on top the one with the oil.
Pinterest is a good place to find essential oil diffuser blends (with 10 drops or less) so you can try different combinations.