hot bag

English

Alternative forms

• hot-bag, hotbag

Noun

hot bag (plural hot bags)

1. A bag designed to generate and/or hold heat, used as a hot compress or warming device.
   • 1904, John Harvey Kellogg ·, Rational Hydrotherapy, page 812:

     The exact effect of the fomentation may be secured by wrapping a hot bag with a moist flannel cloth .

   • 1906, “The Improved Heat-Storing Bag”, in The Voice of the Retail Druggist, volume 1, page 369:

     Think of having a hot water bag which you can take up at any time and by simply removing the stopper have instantly a hot bag that will give off a dry, even heat for hours longer than an ordinary bag filled with water.

   • 1907, A. Winegar-Simpson, “Water-Cure for Headaches”, in Good Housekeeping, volume 44, page 564:

     […] replace the hot bag at the base of the brain with the ice bag.

   • 2015, Clifford L. K. Pang, Hyperthermia in Oncology, page 17:

     Some therapies are performed by heat generated from herbal medicine (Kanli coarse sand therapy), chemical reaction (chemical hot bag therapy), electricity (electrothermal therapy), and so on.

2. A bag for keeping pizza hot during delivery.
   • 2004, Pizza Today - Volume 22, Issues 7-12, page 57:

     The latest hot bag innovation is based on the same technology that enabled the Thermos bottle to keep soup hot for generations of school children.

   • 2012, Alok Kumar Rai, Customer Relationship Management, page 228:

     Domino's HeatWave hot bags were introduced in 1998 to keep pizzas oven-hot during normal delivery. Originally, each hot bag contained a patented heating mechanism charged by plugging into an electric outlet at the store.

   • 2013, Brooke R. Envick, Achieving Entrepreneurial Success, page 51:

     The hot bag, designed to keep pizza hot while being transported to the customer, was invented in 1983.

3. Used other than figuratively or idiomatically: see hot,‎ bag.