Here's how our laundry is divided up. I could have purchased a can for the sheets, but they really just lay on the floor for part of a day usually. We have to walk around this area a lot so this works best on any given day. As you can see with my Dark Colored/Cold pile I just keep stacking it on top even if the can is full. It truly is "Mount Never Rest" around here.
You can see that I lay my grotty wash clothes over the side of the whites can. Anything that is damp I just lay over the sides so they will air dry before getting washed. Please, excuse the floor; it is an unfinished basement and there is some kind of heavy duty glue on the floor that we can't get up. Not pretty, but functional.
When I started this system, I had two kids who separated their own laundry so I put labels on the cans. I was really high-tech - 3x5 cards, a sharpie and packing tape. They've hung on there for 6 1/2 years so I'm not complaining.
I love how lightweight the trash cans are and how portable each load is. I just pick up the can that I want to put into the washer, tip it over and in it goes...so easy!
After I get some wash done, I'll show you what I do after it comes out of the dryer.
What system works well for you in your house? I'd love to know!