Others allow customers to drop off clothing to be washed, dried, and folded. This is often referred to as fluff & fold, wash-n-fold, drop off, bachelor bundles, a service wash or full-service wash. Some staffed laundry facilities also provide dry cleaning pick-up and drop-off. There are over 35,000 laundries throughout the United States. Similar services exist in the United Kingdom where the terms service wash or full-service wash are also in use. The evolution of self-serve laundry services have been seen in some "fluff and fold" (also styled fluff n fold, fluff & fold, fluff 'n' fold, and fluff 'n fold) services provided by various laundromats. These services provide the end user with washing, drying, and folding services on a per pound basis. Some services offer free pickup and delivery, as well as complimentary laundry bags as part of their customer appreciation. Additionally, dry-cleaning services have been known to utilize the pickup and delivery as a means to help generate additional revenue.