Bags
February 5, 2009 9:55 am ReferenceA bag is used for packaging and/or carrying items. For the latter a bag may have one or two handles; 
a shoulder bag has a strap to carry it on the shoulder (the bag is either carried on the side of the shoulder carrying it, or the other side). A rucksack has straps to carry it on the back. There is also be a string bag, with two strings which go over the shoulder and can be used as the fastening as well.
A bag may be closable by a zipper, snap fastener, etc., 
or simply by folding (e.g. in the case of a paper bag). Sometimes a money bag or travel bag has a lock. Sachets may be fabric bags that are filled with pot pourri and tied off with ribbons.
A bag may or may not be disposable; however, even a disposable bag can often be used 
many times, not only for economic but also for environmental reasons. On the other hand there may be logistic or hygienic reasons to use a bag only once. For example, a garbage bag is often disposed of with its content. A bag for packaging a disposable product is often disposed of when it is empty.
An empty bag may or may not be very light and foldable to a small size. If it is, this is convenient for carrying it to the place where it is needed, such as a shop, and for storage of empty bags.