Plastic Singlet bags, also known as shopping bags, grocery bags and t-shirt bags are usually found in supermarkets and discount stores. These plastic bags are great value for money! They are an economical option if a large number of bags are required, or for those on a tight budget. Due to the design and handle structure, singlet bags are very strong and can be used for many purposes. The handles of a singlet bag are simply an extension of each side of the bag, so that the entire bag supports the strain on the handles. Available in many different sizes. Below are three popular sizes.