A reusable shopping bag, sometimes called bag for life is a type of shopping bag which can be reused several times: this is an alternative of single use paper or plastic bags. It is often made from fabric such as canvas, 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 bags, which are available for sale in supermarkets and apparel shops. Reusable shopping 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.  An unpublished report from the UK's Environment Agency found that when compared to a traditional plastic bag, a canvas or cotton reusable bag would have to be reused a total of 171 times to offset the higher carbon emissions. The same study found however that the average cotton bag is used only 51 times before being thrown away. 
1 History 1.1 Use in the United States
1.2 Use in the United Kingdom
1.3 Use in Ireland
1.4 Use in Australia and New Zealand 2 Research
3 Food safety
4 Product safety
5 Legislation and reusable bags
6 Fashion trend
8 Bibliography  History
[Edit] Use in the United States
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. Supermarkets increasingly discourage consumers from using disposable plastic bags and offer alternative reusable shopping bags with small prices, providing information on environmental damage associated with plastic bags.  Because of these encouragements, reusable shopping bags are gradually taking place beside plastic bags. The shape of reusable shopping bags which are now becoming popular is usually different from what they used to be 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 and are sold for $ 0.99-$ 3.00 in most cases.  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. Some supermarkets give points for customers when they bring own shopping bags. When the customers collect a certain amount of points, they can usually get discount coupons or gifts,louis vuitton outlet, 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.  
Since 1999, 2.88 billion reusable bags were imported into the United States for resale and give-aways under Harmonized Tariff Code (HTC) 4202923031 as reported by the United States International Trade Commission.  Unknown numbers of bags were imported under other HTCs or produced domestically. Annual import reports showed acceleration of bag distribution with the rise of environmental claims of reusable bag reseller in the United States from 130 million in 1999, to 504 million in 2008. Of these, 1.6 Billion bags were imported from China between 2004 and 2008. 
[Edit] Use in the United Kingdom
They are offered in most British supermarkets. In the UK, these are sold for a nominal sum, usually 10 pence, and are replaced for free. The bags are more durable than standard bags, ensuring that they may be reused many times .
The main purpose of this is to ensure that the bags are recycled (which usually earns the retailer a small amount of money per bag), and unlike with free carrier bags there is a (small) financial incentive to bring the bags back for recycling, lessening the environmental impact.
In contrast to more spartan carrier bags, bags for life tend to be colourful and show some aspect of the supermarket's advertising. Some supermarkets maintain the same design for years at a time, whereas some, like Waitrose, rotate the designs to tie in with either the season or the most recent advertising campaign.
Waitrose 'was the first supermarket to use them.  As of April 2008, Marks and Spencer are giving their Bags for life free to every customer, as their normal plastic bags will have to be paid for from May 6. This will be a small sum of 5 pence a carrier. The bags are given to the customer every time they shop so they will have plenty when the switchover in May comes live. 
Apollo Bags was the first company in the United Kingdom to introduce the popular shopping bag with a rubber-based biodegrable lining which will degrade within our lifetime. 
Increasingly the use of Jute and Juco bags has provided a natural alternative to single use plastic bags and reusable plastic bags. Over 25 million have been sold in the UK. Reusable plastic bags do not have a simple end of life disposal route. Many are made of mixed plastics so they cannot be easily recycled or are so highly coloured the only reuse is black bin bags which are energy intensive to convert.
Jute bags have become a crossover product from an alternative to plastics to a fashion / shopper accessory. Jute bags will last for about 4 years - if used correctly will replace over 600 single bags. At end of life they can be used as planters for growing garden vegetables.
[Edit] Use in Ireland
In Ireland, they were introduced when the Plastic Bag Environmental Levy was brought in to reduce the massive amount of disposable bags being used annually. Bags costing 70 euro cents or more are exempt from the levy.
[Edit] Use in Australia and New Zealand
These bags are known as green bags in Australia due to their relative environmental friendliness and usual (though far from universal) green color. Green Bags and similar reusable shopping bags are commonly distributed at the point of sale by supermarkets and other retail outlets. They are intended to be reused repeatedly to replace the use of hundreds of HDPE plastic bags. Most green bags are made of 100% Non-woven Polypropylene which is recyclable but not biodegradable. Some companies claim to be making NWPP bags from recycled material, however with current manufacturing techniques this is not possible. All NWPP bags are made from virgin material. Similar bags are made of jute, canvas, calico or hemp but are not discussed here. A typical base insert is 200x300 mm and weighs 30 g. It is generally made of a stiff plastic.
The accelerating volume of reusable bags being imported and resold, along with the 2008 Wall Street Journal article, An Inconvenient Bag, that documented that only 10% of bags are actually being reused  raise statistical questions about their effectiveness and the possibility that these heavier bags have become the new disposable bag. The 2004-2008 Chinese import numbers were enough sell or give away to each family of four in America with more than 21.2 bags over the just the past five years. More directly in light of the 2004 US International Trade Commission Study, Polyethylene Retail Carrier Bags from China, Malaysia, and Thailand,  that reported the total annual retail carrier bag consumption is the United States at 97 billion bags annually, the 504 million bags imported from China in 2008 offset just 9.7 billion retail carrier bags (10% of total as reported by the Wall Street Journal) which translated to each reusable bag on average only offset just 19.5 retail carrier bags during its lifespan. Although reusable bags are capable of offsetting more, it is likely that due to lack of use, increased free distribution of these heavier bags, commercialization and commoditization that they are becoming a disposable product with a limited lifespan.
In 2009, Walmart Stores proposed turning three California stores in to reusable bag only stores.  Concurrently, Walmart was prepared to introduce a $ 0.15 reusable bag. On 23 October 2009 Walmart abandoned plans to remove carrier bags but they continued to introduce the new lower cost bags. In contrast to previous bags sold at $ 0.99 and $ 0.50 these lower cost bags may reduce price incentive to reuse these heavy bags.
[Edit] Food safety
Most reusable bag shoppers do not wash their bags once they return home and the bags may be leading to food poisoning according to Dr. Richard Summerbell, research director at Toronto-based Sporometrics and former chief of medical mycology for the Ontario Ministry of Health.  Because of their repeated exposure to raw meats and vegetable there is an increased risk of foodborne illness. A 2008 study of bags, sponsored by the Environmental and Plastics Industry Council of Canada, found mold and bacterial levels in one reusable bag to be 300% greater than the levels that would be considered safe in drinking water.   The study does not differentiate between non-hemp bags and hemp bags, which have natural antimildew and antimicrobial properties. 
A 2010 joint University of Arizona and Limo Loma University study (sponsored by the American Chemistry Council, a trade group that advocates on behalf of disposable plastic bag manufacturers) the found that bacteria and pose a serious risk to public health coli was found in 12% of the bags.  The study made the following recommendations:
States should consider requiring printed instructions on reusable bags indicating they need to cleaned or bleached between uses.
State and local governments should invest in a public education campaign to alert the public about risk and prevention.
When using reusable bags, consumers should be careful to separate raw foods from other food products.
Consumers should not use reusable food bags for other purposes such as carrying books or gym clothes.
Consumers should not store meat or produce in the trunks of their cars because the higher temperature promotes growth of bacteria, which can contaminate reusable bags.
The study further showed that machine or hand washing even without the presence of bleach was effective in reducing coliform and other bacteria in the bags to levels below detection. 
A Consumer Reports article criticized the 2010 study, calling into question the small sample size of bags examined in the study and the questionable danger of the type and amount of bacteria found. Michael Hansen, senior staff scientist at Consumers Union,Louis Vuitton Sunglasses, stated A person eating an average bag of salad greens gets more exposure to these bacteria than if they had licked the insides of the dirtiest bag from this study. [Edit] Product safety
According to Bloomberg News, in September 2010, ,],[
After a report in the Tampa Tribune  in November 2010 that elevated levels of lead were found in similar reusable bags, the Food and Drug Administration opened an investigation responding to calls by US environmental and consumer groups, as well as US Senator Charles Schumer, to investigate the reusable bags commonly distributed by grocery stores and large retail chains.  Winn-Dixie recalled their bags after they were directly cited in the investigation. 
In December 2010, popular Canadian-based athletic retailer Lululemon Athletica recalled complimentary reusable bags distributed since November 2009 because a recall on reusable bags because of similar findings on January 6, 2011.  On January 12,Coach Shoes, 2011, The Center for Environmental Health announced Disney-themed bags from US grocery chain Safeway have been found to contain levels of lead 15 to 17 times the current federal limit of 300ppm.  Safeway recalled bags that had been identified as containing high levels of lead in late January 2011.
In January 2011, USA Today ran an article based on a report from the Center for Consumer Freedom, a front group for the Eagle, Bloom and other grocery chains and retailers contained levels of lead in excess of 100 parts per million, the maximum amount allowed under law in many US states. They have not produced their testing methods and data, and many organizations feel this was an attempt to discredit the use of reusable bags.  Bloom stopped distributing the bags due to toxicity levels prior to the study, but did not recall the bags. 
Other concerns have been raised about the safety of reusable bags due to infrequent washing and the presence of bacteria  but these have mostly been discounted. 
[Edit] Legislation and reusable bags
Some governments have encouraged the use of reusable shopping bags through the regulation of plastic bags with bans, recycling mandates, taxes or fees.  The legislation to discourage plastic bag use has been passed in parts of South Africa, Ireland, Hong Kong and Taiwan.
In 2002 the Australian Federal Government studied the use of throwaway plastic bags and threatened to outlaw them if retailers did not voluntarily discourage their use. In 2003 the government negotiated with the Australian Retailers Association a voluntary progressive reduction of plastic bag use which led to a number of initiatives, including the widespread distribution and promotion of Green Bags.
[Edit] Fashion trend
Because of the encouragement of reusable shopping bags by governments and supermarkets, reusable shopping bags have become one of the new fashion trends. The apparel industry also contributed to make it popular to have fashionable reusable shopping bags instead of disposable plastic bags. Famous designers and popular fashion brand companies are promoting their original shopping bags and release new designs one after another. British designer Anya Hindmarch's £ 15 on the Internet. 
[Edit] References  Bibliography Heckscher M., Lu LT, Hsiao TY, Shang NC, Yu YH, Ma HW, Njeru J., Wilson E.,