If it is accessible, it can be used. I tend to toss things in groups in ziplocks, then pack the ziplocks into bigger bags.

It served DW well today. We were at a location when she had a slight emergency (further detail might be frowned on by DW). I had one of the best tools for helping with this emergency, inside a ziplock, in a canvas bag, in the back of the car. The item for which I was looking was in the second ziplock. DW was happy it was easy to find.

I can pack a lot, but I don't tend to pack so neatly.