Sort Clothes by Fabric Type
If you have heavier items like towels, you should consider separating them from lighter weighted clothes to prevent any abrasion and damage to more delicate fabrics. For the same reason, separate clothes with zipper and buttons from knits and sheer lingerie.
Another reason to separate laundry by fabric type is that heavier items take longer to dry than lighter ones. By drying them together, it can cause the lighter items to over dry and mightstress the fibers.