Use for Crystal Light Canisters?
If you use it to hold plastic grocery bags, you can cut an X shaped slit on the lid, then pull the bags through--you wouldnt even have to open it. They could also be used for storing small amounts of dry goods--beans, lentils, peas, rice. You could premeasure...
Babysafe Homemade Laundry Detergent?
I dont. I use regular detergent I get on sale (and with coupons). I found it made no difference, although I started with dye and fragrance free.