General Hiking and Backpacking
A good first aid kit is one of the 10 essentials of hiking. Washington Trails Association has a great page with resources.
A larger version of the above and might want to consider adding an Automated External Defilibrator (AED) for large multi-day projects.
Chainsaws injuries can create massive bleeding issues and need some specialized items. OSHA has specifications for loggers which your kit should conform to. Pressure on the wound is the primary control technique. Examples (search on the web for more) (cheaper in large quantities):
- Absorbent Gauze Pads 5x9 (box of 40)
- QuikClot Clotting sponges
- Israeli Bandage
- Cederroth 4-1 Bloodstopper
Incident report forms
Print and put in your first aid kit in a waterproof baggie.