I have seen bags labeled "crib bags" on Australian websites. I never really understand what they are precisely or whether "crib" refers to the material or the shape of the bag.
It seems the bags that fall under this category range from satchels, to tool bags, to carryalls (holdalls in BrE.) For example this site specializes in them. What exactly is a crib bag? And what does "crib" refer to?

(source: ruggedxtremes.com)