Your answers will improve if you can give us more information, such as:

How many hikers will be served by the contents of the kit?

What season will you be hiking in, and in what location?

Will you be going off-trail?

What sort of training do you have? (Because there's no sense taking items you won't know hiow to use.)

Do you or any of the other hikers have specific medical needs, such as allergies, to take into consideration?

There are probably several more good questions I am missing here, but the more you say, the better the forum members can sort out the details for you. Otherwise, there's just not much useful to tell you, based on the scanty info you provided.