I pre-sort my laundry in the laundry room. I have 4 hampers set up and have them organized by darks, lights, towels, and delicates. As I bring laundry down from bedrooms throughout the week, or if people "shed" laundry when they go through the laundry room, the laundry gets sorted into these hampers. When a bin is full, I wash that load of laundry. It saves time by not having to constantly sort laundry, or spend time sorting all those loads when I need to wash them - it's already done and I can just throw the load in!