I agree with Desperado.

Fishing line is a very "multi-use" item, handy to have even if you do not use it for fishing (e.g. cordage/thread).

Hooks are very small and light, use them (and cotton tinder) to fill-in the voids in your kit.

A fishing kit can also be used to catch birds and maybe even small mammals, although it is not humane and usually very illegal.

Mike