As mentioned above we all have our most used and not used.
Reading a few items listed above as not used I use most often .. My manfrotto mono pole, carbon or course ... for weight.
Prime lenses. for sure ... give me a NEW model 400 F5.6 canon .. don't want your new 100-400
Back pack. check Lowe Pro AW
580EXII ...
am using the 2x + 70-200
Sekonic L-758dr with my Linhof
All my tripods with my 303 pano head
But one thing I really frothed over to get and have never really used, and have had it for over two years is my 85 F1.2 .. so wanted that lens, I saw it 2nd hand, in perfect condition had some cash, bought it and a 35F1.4, I use that very often... but the 85 ... nah
I'm just not a people person ... but I am ready if I have to ha....
But I'll never sell it either....