Just started wondering about this. My daily EDC kit is a medium-size freezer Zip-loc bag with both PSK and FAK items. I am starting to think that it might be more efficient to keep first-aid items in a kit, and personal survival items in another kit. This way, since first aid items end up being used more often, they would be accessible without turning the PSK kit upside down. So, my guess is... two Zip-locs, one for first aid and one for survival.

How do you do it?