clothes pegs are essential!

Indeed they are - see below. Lovely thread; the best of life in terms of glorious & essential clutter of which I can never have enough. So, depending on the gig...

In my regular bag:

Zoom H4
Plastic sopranino recorder
Brass whistle (high F)
Cuckoo call
Khomus (Altai Jew's Harp)
Ultra low Doromb (Hugarian Jew's harp - 'Tibet' by Soltan Szilagyi)
Four leafed 'Ho-Ho' (Chinese Jew's harp in various pitches)
Dan Moi in A
Dan Moi in G
Dan Moi in D
Low pitched Dan Moi (Ab)
Low pitched Dan Moi (A)
Rattles, fowler calls,
Burmese Kyeezee
Occasional mbiras

My regular session bag:

Regular violin + 2 bows
Occasional 5 string violin
Mutes (wood / brass / rubber AND various clothes pegs)
Black Sea Fiddle (Karandeniz Kenence) + 1 bow & brass mute
Doromb in G
Doromb in D
Doromb in A
Doromb in E
Spare strings
Rosin
Electronic shruti box
shells
stones
Fisherman's Friends (sugar free)

Crwth box:

Crwth
Bow
Rosin
Tuning key
Harmonic (overtone) pipe in E
ankle bells
animal bells
spare sets of strings
emery cloth
Swiss warblers
Doromb in low E.
Simple system wide bore C clarinet

Citera box:

Citera
Tuning key
Plectrums (Gibson H large black triangles)
Harmonic pipe in D
Plastic Skull rattle
Hohner Melodica Alto
Doromb in low D
Overton low D tabor pipe
Spurtle (complete with tartan ribbon)
Spare strings (especially plain 00.9s of which I go through dozens)
Diverse penny whistles
Slovakian drone flute
Yugoslavian double flute
Clockwork birds
Bird warblers
Swiss warblers
Diverse Acme fowler calls (duck, nightingale, crow etc.)

Also:

Korg Kaossilator
Behringer UB802 Eurorack mixer
Zoom 505II effects peddle
Sure SM57 / Behringer B1
Leads / cases
Roland Microcube
Pocket cornet
Harmon mute
Valve oil
Scacciapensieri (Italian jew's harp)
Marranzano (Sicialian Jew's Harp)
Murchanga (Himalayan Jew's harp)

etc.