A backpack (also called rucksack, knapsack, packsack, pack, or bergen) is, in its simplest form, a cloth sack carried on one's back and secured with two straps that go over the shoulders, but there can be exceptions. Lightweight types of backpacks are sometimes worn on only one shoulder strap.
A briefcase is a narrow hard-sided box-shaped bag or case used mainly for carrying papers and other documents and equipped with a handle. Lawyers commonly use briefcases to carry briefs to present to a court, hence the name. Businesspeople and other professionals also use briefcases to carry important papers and, today, laptop computers.
A duffel bag (duffle bag, kit bag or gym bag) is a large cylindrical bag made of cloth (or other fabric) with a drawstring closure at the top.
A haversack or small pack is a bag with a single shoulder strap. Although similar to a backpack, the single shoulder strap differentiates this type from other backpacks. There are exceptions to this general rule.
Baggage or luggage consists of bags, cases, and containers which hold a traveller's articles during transit.
A satchel is a bag, often with a strap. The strap is often worn so that it diagonally crosses the body, with the bag hanging on the opposite hip, rather than hanging directly down from the shoulder. They are traditionally used for carrying books. The back of a satchel extends to form a flap that folds over to cover the top and fastens in the front. Unlike a briefcase, a satchel is soft-sided.
A suitcase is a general term for a distinguishable form of luggage. It is often a somewhat flat, rectangular-shaped bag with rounded/square corners, either metal, hard plastic or made of cloth, vinyl or leather that more or less retains its shape. It has a carrying handle on one side and is used mainly for transporting clothes and other possessions during trips. It opens on hinges like a door. Suitcases lock with keys or a combination.
A trunk, also known as a travel trunk, is a large cuboid container for holding clothes and other personal belongings, typically about 30 inches to 36 inches long with varying widths of 16 to 22 inches and various heights. They were most commonly used for extended periods away from home, such as for boarding school, or long trips abroad. Most trunks are now used as either furniture such as glass-covered coffee-tables or decorative storage for everything from blankets and linens to memorabilia and military paraphernalia. Trunks are differentiated from chests by their more rugged construction due to their intended use as luggage, instead of the latter's pure storage.
A wallet, or billfold, is a small, flat case that is used to carry personal items such as cash, credit cards, identification documents (driver's license, identification card, club card, etc.), photographs, gift cards, business cards and other paper or laminated cards. Wallets are generally made of leather or fabrics, and they are usually pocket-sized but not always foldable.