A gunny sack is an inexpensive bag made of burlap

Burlap

Hessian , or burlap in the US, is a woven fabric usually made from skin of the jute plant or sisal fibres, or may be combined with other vegetable fibres to make rope, nets, and similar products...

, also known as a 'gunny shoe'. Gunny sacks are traditionally used for transporting grains, potatoes, and other agricultural products. Today they are also sometimes used as sandbags for erosion control

Erosion control

Erosion control is the practice of preventing or controlling wind or water erosion in agriculture, land development and construction. Effective erosion controls are important techniques in preventing water pollution and soil loss.-Introduction:...

. They are usually made from jute

Jute

Jute is a long, soft, shiny vegetable fibre that can be spun into coarse, strong threads. It is produced from plants in the genus Corchorus, which has been classified in the family Tiliaceae, or more recently in Malvaceae....

 or other natural fiber

Natural fiber

Fibers or fibres are a class of hair-like materials that are continuous filaments or are in discrete elongated pieces, similar to pieces of thread. They can be spun into filaments, thread, or rope. They can be used as a component of composite materials. They can also be matted into sheets to...

s, although modern sacks are often made from polypropylene

Polypropylene

Polypropylene , also known as polypropene, is a thermoplastic polymer used in a wide variety of applications including packaging, textiles , stationery, plastic parts and reusable containers of various types, laboratory equipment, loudspeakers, automotive components, and polymer banknotes...

. Gunny sacks are also popular in the traditional children's game of sack race

Sack race

The sack race or gunny sack race is a competitive game in which participants place both of their legs inside a sack or pillow case that reaches their waist or neck and jump forward from a starting point toward a finish line. The first person to cross the finish line is the winner of the race.Sack...

s.

Size

A gunny sack holds approximately 100 pounds of potatoes. Even though gunny sacks are no longer used for that purpose, among Idaho

Idaho

Idaho is a state in the Rocky Mountain area of the United States. The state's largest city and capital is Boise. Residents are called "Idahoans". Idaho was admitted to the Union on July 3, 1890, as the 43rd state....

 farmers the common measurement unit of potatoes is still the "sack".

Properties

Because gunny sacks are made from natural fiber

Natural fiber

Fibers or fibres are a class of hair-like materials that are continuous filaments or are in discrete elongated pieces, similar to pieces of thread. They can be spun into filaments, thread, or rope. They can be used as a component of composite materials. They can also be matted into sheets to...

s, some consider them to be environmentally friendly

Environmentally friendly

Environmentally friendly are terms used to refer to goods and services, laws, guidelines and policies claimed to inflict minimal or no harm on the environment....

. They are non-carcinogenic and non-toxic. High breathability allows air to pass through them, which helps packaged grains or other agricultural commodities stay fresh.

Sacks made from jute

Jute

Jute is a long, soft, shiny vegetable fibre that can be spun into coarse, strong threads. It is produced from plants in the genus Corchorus, which has been classified in the family Tiliaceae, or more recently in Malvaceae....

, hemp

Hemp

Hemp is mostly used as a name for low tetrahydrocannabinol strains of the plant Cannabis sativa, of fiber and/or oilseed varieties. In modern times, hemp has been used for industrial purposes including paper, textiles, biodegradable plastics, construction, health food and fuel with modest...

 and kenaf

Kenaf

Kenaf [Etymology: Persian], Hibiscus cannabinus, is a plant in the Malvaceae family. Hibiscus cannabinus is in the genus Hibiscus and is probably native to southern Asia, though its exact natural origin is unknown. The name also applies to the fibre obtained from this plant...

 fiber have high tensile strength

Tensile strength

Ultimate tensile strength , often shortened to tensile strength or ultimate strength, is the maximum stress that a material can withstand while being stretched or pulled before necking, which is when the specimen's cross-section starts to significantly contract...

. As a result, piling sacks one on top of the other does not tear or distort the yarn of the lowest residing sacks in the pile.