A reusable shopping bag, sometimes called bag-for-life in the UK, is a type of shopping bag which can be reused many times. It is an alternative to single-use paper or plastic bags. It is often made from fabric such as canvas, natural fibres such as Jute, woven synthetic fibers, or a thick plastic that is more durable than disposable plastic bags, allowing multiple use.
Reusable shopping bags are a kind of carrier bag, which are available for sale in supermarkets and apparel shops. Some reusable bags have been found to contain high amounts of lead. Reusable bags require more energy to produce than common plastic shopping bags. one reusable bag requires the same amount of energy as an estimated 28 traditional plastic shopping bags or eight paper bags. "If used once per week, four or five reusable bags will replace 520 plastic bags a year", according to Nick Sterling, research director at Natural Capitalism Solutions. A study commissioned by the United Kingdom Environment Agency in 2005 found that the average cotton bag is used only 51 times before being thrown away. In some cases, reusable bags need to be used over 100 times before they are better for the environment than single-use plastic bags.
First introduced in the US in 1977, plastic shopping bags for bagging groceries at stores flourished in the 1980s and 1990s, replacing paper bags. In 1990s, governments in some countries started to impose taxes on distribution of disposable plastic bags or to regulate the use of them. Some supermarkets have encouraged shoppers to stop using disposable plastic bags, by for example offering inexpensive reusable shopping bags or providing information on plastic bags' environmental damage. The physical shape of reusable shopping bags is often different than was typical before the prevalence of plastic bags. The apparel industry promotes reusable shopping bags as sustainable fashion.
Many supermarkets encourage the use of reusable shopping bags to increase sales and profit margins. Most non woven polypropylene bags cost $0.10-0.25 to produce but are sold for $0.99-$3.00. As stores receive diminishing returns due to saturated markets, there are concerns that prices will drop and they will become the new single use bag. Some major supermarket chains have string or calico bags available for sale. They are sold with announcement of environmental issues in many cases. The ones sold in supermarkets often have designs related to nature, such as prints of trees or that of the earth, in order to emphasize environmental issues. One startup company out of Duluth, Minnesota embroiders their bags with their local Aerial Lift Bridge on it. Some supermarkets have rewards programs for customers who bring own shopping bags. When the customers collect a certain amount of points, they can usually get discount coupons or gifts, which motivate customers to reduce plastic bag use. Some retailers such as Whole Foods Market and Target offer a cash discount for bringing in reusable bags.