A group of items needed to build or assemble something is also a kit, like a model airplane kit. The case you keep these things in can also be called a kit. A completely different sort of kit is a baby animal like a fox or beaver kit.
What kit means?
1a(1) : a collection of articles usually for personal use a travel kit. (2) : a set of tools or implements a carpenter's kit. (3) : a set of parts to be assembled or worked up a model-airplane kit. (4) : a packaged collection of related material a convention kit.