I'm originally from Cincinnati and did some test panels for P&G years ago, so I still get marketing stuff from them. This time I succumbed. They have a new brand/product called EC30 that is interesting. Basically they have removed the water and other liquid fillers from soap products, which makes them more energy efficient to transport. EC30 products are small lightweight swatches of various toiletry and cleaning items that are packaged in compostable cardboard (no plastic anywhere). https://ec30clean.com/
I just bought a trial kit as they're on sale right now and I wanted to check them out. I received a kit contained laundry detergent, hand wash, body wash, toilet cleaner and shampoo. The shampoo, for example, is a 1.5" square pad that is a about 1/8" thick. To use it, you soak it for 3 seconds, then activate the lather with your hands. My test kit came with 10 pads. The hand wash pads are about 1 square inch and there are 24 pads in the box. They are all extremely lightweight: the shampoo pads weigh a little less than one gram.
I tried one of the hand wash pads and it worked really well. I was thinking that I might take these and use them for laundry. The laundry pads are a lot bigger and designed for regular loads. Although if you were renting an apartment in Europe with a washer, you could conceivably bring some of these along instead of having to buy it there. And if you are hiking or camping, I think these would be invaluable. I showed them to my daughter and that was the first thing she thought of.
These are not all-natural products - they have the same ingredients most other soaps do - but I did like the idea of the packaging and that it is all compostable. And of course, its potential use as a travel product. :)