How many film holders (per format) do you own?

[Zach In Israel]

I was wondering, how many film holders do most people have for any given format? I currently have 12 4x5 holders, and a quickload holder for which I can't get film locally. I was thinking about getting a few more holders so I can turn a bunch of them into vacuum backs for astrophotography, that would put my total in the 20-30 range.

[Roman L. Ryzhiy]

Grafmatic is good for me.

[Walter Calahan]

This is a state secret. Homeland Security won't let me tell you.

[Mark Woods]

I have about 20 of each for 4x5, 5x7, & 8x10. I actually have about double in 4x5, but I don't have them prepped or in regular rotation with the others.

[ic-racer]

4x5 = 19
8x10 = 5
2x3 = 1

[Frank Petronio]

It's nice to have enough to load an entire box at once, plus some spares.

[anchored]

Have 24 4"x5" film backs... usually carry 10 on a shoot. Also own polaroid, QL, and 220-roll film backs, but they've never been used.

[Sanjay Sen]

4x5: 17 holders
5x7: 2 holders (exploring this format, with a reducing back)
8x10: 10 holders
5x12: 1 holder (pondering about this format)

[Eric Woodbury]

I got them when they were cheap and I got enough so I could go out for a week or two without reloads in the car. Hate that. I load them all HP5+, 45 and 57. 50 ea.

[Laurent]

I used to have 20 in 4/5, went back to 15 (mostly because I wanted to rationalize a bit, so I sold the Arca and Linhof ones to keep only Fidelity)

I plan to buy a few more just to have some spare.

I usually carry 5 on the field, and only use the whole lot when on vacation, to spend less time unsing the changing tent.