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A bag (also known as a sack) is a non-rigid mostly semi-rigid container, made of paper, cloth, plastic, leather, or some other flexible material.

A 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 keychain or key chain is a small chain, usually made from metal or plastic, that connects a small item to a keyring. The length of a keychain allows an item to be used more easily than if connected directly to a keyring. Some keychains allow one or both ends the ability to rotate, keeping the keychain from becoming twisted, while the item is being used. A keychain can also be a connecting link between a keyring and the belt of an individual. It is usually employed by personnel whose job demands frequent use of keys, such as a security guard, prison officer, janitor, or retail store manager. The chain is often retractable, and therefore may be a nylon rope, instead of an actual metal chain. The chain ensures that the keys remain attached to the individual using them, makes accidental loss less likely, and saves on wear and tear on the pockets of the user.

A bottle opener is a device that enables the removal of metal bottle caps from bottles. More generally, it might be thought to include corkscrews used to remove cork or plastic stoppers from wine bottles.

Another name for some types of bottle opener is church key.