In British English, the same kind of bag is called a sports bag. A holdall (or occasionally hold-all) may be a similar bag but may often have wheels and possibly a telescopic handle.
A backpack is a bag worn on your back and typically has two straps over the shoulders. A rucksack is a specific backpack most often used for hiking or camping. It is larger than a backpack and usually has a frame to support the bag's weight.
What does a fanny pack mean in British slang? Fanny pack is an American name for a little pack carried around the waist. In UK it is called a Bum Bag. Fanny is slang for bottom in USA.