Some random ones...
Like the pill container tip, I use old film containers for everything from matches, hot sauce (Mtn House meals can get blah), seasoning salt, and chalk for my box call during turkey season. Old tobacco cans work well for holding diaphragm calls and coffee too.
My optics are always getting dirty in the field, even with using a protected harness. A birder (yeah, I know, those lame birders) once taught me that for quick removal of dust to hold the optic over your head and gently blow off the dirt, so there's less chance of spitting on the lens and gravity will help you blow it out. On backpack hunts, there's always down time in the evening, so I spend time cleaning my optics if they're real dirty with a small cleaning kit (microfiber cloth, brush, cleaning solution, qtips).
I always keep my headlamp in a pocket on me especially when hunting the afternoon, since it always seems to get dark fast and I used to end up digging thru my pack in the dark to find it. I also keep spare batteries taped together in my pants pocket, as well as a backup light in my pack.
First aid.. I posted about this before, but I keep an emergency kit with super glue and duct tape for bad cuts, moleskin for blisters, and a combat tourniquet for bad situations.
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