I have 3 boxes tiered in sizes. The have pics of sewing machines on them. They stand one on top of the other. Safety pins are open and in the top (smallest) box. They all have the plastic covers on them to make them easier to use. Once I open them to remove from a quilt sandwich I see no need to close them only to open them to use them later.
I did process improvements at work and guess that stays with me. Ha! Really they don't stick me and maybe that is because I have the plastic covers on them.
Just a matter of choice.