Seems to be be a pretty good kit. I have the following sugestions:
- store the pills in seperate bags (a vacuum packing machine would be good for this) and put these bags into a vial for protection
- if possible, pack small good quality tweezers
- if you donīt pack lures, you donīt need the swivels
- get more hooks and make sure theyīre good quality (really sharp and small barbs)
- if possible pack more line
- use a plastic whistle, theyīre better for cold weather

You could use the snare wire for landing a fish. Be sure to have handle for the snare or you risk cutting yourself. You donīt need anything for sutures. A wound should NEVER be closed in the field.
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If it isnīt broken, it doesnīt have enough features yet.