What's the best non-musical accessory you've ever bought?

Ever...? This is a tough one.

Probably my Comfort Strapp's and the Neotech straps. I'm not sure I could have continued without these

 

Glasses are hard to beat.

 

Gaffers tape?

 

Tools for proper set up maintenance

 

Wait a second...
Except for the fan/dolly, which are multi use items, everything you listed is music related.
You want non-music? Socks. That's right, socks. can't tune'em, pluck'em, slap'em or plug'em in.

And let's not forget a good crowbar...
It's where all the young ravens go for happy hour.

Carry on...

 

Dremel tool.

 

Grolsch beer. For the strap lock washers...well, that's just a bonus for me. I love me some grolsch. Unfortunately, I can only buy it at one place around here, and it's never on the way.

 

Soldering Iron
Hakko FX888D-23BY Digital Soldering Station FX-888D FX-888 (blue & yellow) https://www.amazon.com/dp/B00ANZRT4M/ref=cm_sw_r_cp_apa_i_QJV.CbN78ER6K

Mini display port to HDMI 10ft cable. It allows me to put my computer screen on the big screen for practice. I sometime put lyrics up there. I sometimes control my Amazing Slow Downer app up there. But I can stand behind my mic and see everything I'm doing on my computer.

 

Probably the best thing was an advent calendar from a couple of years ago. Instead of chocolates, each day you'd get a new screw driver piece, to eventually make up a full set of Mikro Kraftform & Kraftform tool set from Wera. Fits in a gig bag very easily, only handy thing it's missing is a pair of pliers but I'm not complaining. My basses all have a mixture of screw sizes so this is such a great kit. The case has velcro so I can stick it to the rat fur on top of my amp during a gig incase of a quick adjustment.

Similar to this, but has 2 driver sizes - Kraftform Kompakt 60, 62 - Wera Product finder

Was such a cool gift idea! It's no surprise my dad is a handyman.

 

My MONO Vertigo, hands down.

 

Earplugs

 

Pochett cases for some of my clarinets.

 

Something that really helped me get my head right and allowed me to focus on music.

Divorce

 

https://www.musiciansfriend.com/accessories/peak-music-stands-portable-music-stand

This folding music stand has been wonderful. Have never seen one that folds up and packs away so compactly and still holds a full 4" binder.

 

Leatherman
a good waterproof backpack

 

Earplugs, hands-down.

Used to own Alpine Musicsafe Pros, switched to EarPeace recently.

 

Compression socks for long gigs standing & jumping around all night. (Actually they’re my snowboarding socks). Less tired on the gig, less sore the next day.

MarkBass Bass Keeper. It’s a guitar Stand replacement - Velcro your bass’ neck to you cabs’ side handle. Small, light, plus keeps cables bundled in my gig case.

Hearos earplugs.
Comfort Strapp.
Hand cart.
Mono M80 Dual bass gig bag
Floor fan. Industrial strength.
Amazing Slow Downer app iPhone
Velcro cable ties.

Black Suitcase (got it for free, does that count?). Carry on sized with wheels & telescoping handle. Fits micro amp, backup amp, pedalboard, cables, mic, tools, spares, etc. Fits on top of my 212 cab perfectly too.

 

Custom fitted 15 db cut earplugs.