And, of course, you can fit several things in your wallet that could help without seriously bulking it up, maybe not all of the following at once, but whatever you feel you might use:

• A foot or two of duct tape, folded flat.
• Bandaids
• Paperclips
• P-38 (can opener)
• Needle and thread. (Weave the needle through an index card, wrap the thread around it).
• Dental floss wrapped around a business card.
• Tinder card (laminated vaseline soaked cotton ball)
• Fresnel lens magnifier
• Credit card sized diamond coated knife sharpener (I have one of these. I like it.)

Maybe wrap the handle of the light with paracord?

"Bare minimum" can either mean number of items, or bulk of items. If you can pack additional features into the same space with very little additonal weight, why not?