The United States of America cuts down about 14 million trees every year for paper shopping bags. If everyone used a reusable shopping bag, this number would decrease dramatically to about 2-3 million.

It depends on the type of shopping bag.

Some shopping bags are designed to be reusable, such as canvas bags or sturdy reusable plastic bags. These types of bags are intended to be used multiple times, reducing the need for single-use plastic bags and reducing waste.

However, other shopping bags, such as thin plastic bags commonly found at grocery stores, are not designed for reuse and can easily tear or break after just a few uses. These bags are often considered single-use and are not as environmentally friendly as reusable shopping bags.

In general, if you're looking to reduce waste and be more environmentally friendly, it's best to choose durable, reusable shopping bags made from materials like canvas, jute, or thick plastic. These bags can be used many times, which can help reduce the amount of waste generated by single-use shopping bags.

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If you don't have a book bag for school, you can use a backpack or another suitable bag to carry your books and school supplies. Alternatively, you can also carry your items in a reusable shopping bag or a tote bag. Just make sure the bag is sturdy enough to hold everything you need for the day.

As a general answer i would say a cotton bag is the best re-usable bag as:

1) Its from a renewable source

2) It can be recycled or up cycled

3) It can be washed and used for years and year unlike plastic bags

4) It looks good and performs well.

However, cotton bags are expensive and weigh a lot so they are not the preferred choice.

It also depends what you mean by best and reusable?