How many layers for SAK EDC?

2 layer alox for any full sized sak going in my pocket. I have a few 3 and 4 layers in various places around the house and in my car. I also have a mini champ on my keychain which is a 3 layer, but small enough that the bulk doesn't bother me.
 
Two layers, but in actuality I also carry a three layer camper.

I wouldn't mind carrying three layers but only for something special like a Yeoman or discontinued Camper with the camping logo
 
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