Why towels are often a separate load
Towels are bulky, absorbent and commonly shed lint. They can rub against lighter garments and may need a different wash time or temperature than everyday clothing. Separating them also makes it easier to group similar colors and fabric weights.
When a mixed load may be reasonable
Mixing can be lower risk when the clothing is sturdy, similar in color, has compatible care-label settings and does not easily collect lint. Avoid pairing towels with delicate items, dark lint-attracting synthetics or garments that call for a gentler cycle.
Check load size too
Wet towels become heavy. Do not pack the drum simply to avoid running a second load. Leave enough room for the load to move and rinse effectively.
Care labels still decide
A general towel rule cannot account for specialty fibers, decorative trims or coatings. If the care labels disagree, split the load.
Garment care labels, appliance manuals and laundry-product directions can be more specific than a general guide. Use them when they set a tighter limit.