I am not looking forward to sorting my collection. 30 years across 2 large 6 gal (22.8L), 4 of 4L tubs, and half dozen cardboard boxes. I had to make 6 trips to move all of my Lego out of storage,the whole lot are too big and heavy to do in 1 trip.
I plan to separate all technic and non-technic first. Then by part type (1x1 brick, regular, 1x1 brick, round, 1x1 brick, cone, etc) Colors will be ignored.
I did have some free small tubs for uncommon parts. They are Gerber tub that is about 1 cup (about 240 mL) so if you know someone who has a baby and feeding him/her Gerber food, ask them to save empty tubs.
Now to figure out about storing the rest.