Customize the first aid kit checklists for your situation
This set of first aid checklists is an excellent reference. It isn’t necessarily comprehensive or appropriate for your purposes. So, use your judgment and add and remove items based on:
You should also look through each topic in your Wilderness First Aid / First Responder course textbooks. For each medical problem, consider which items or medications you wouldn’t want to do without versus what can be improvised. Over time, you’ll get more comfortable making adjustments.
Taking that into consideration, this wilderness first aid kits document has checklists for 5 different expedition types:
And it’s divided into sections for items to carry on your body, basic life support, tools, medications, wound care, and other miscellaneous items.