3rd party stowage: either in a box, or rolled up... both make manufacturing much simpler.

I guess the best option is to raid Jakko's reference collection, or spend hours scouring every relevant photo you can find online.

Or, if you just want to add a little interest, use a few sparingly, as part of a scenario:

When in that situation, I find it helps to have the figures you're going to include and what they're doing. Then you just need to find the props to support the scene, like in a stage play.

If I guy is reaching into a box, the internal logic of the scene might be enough to carry it off. At least, that's my theory.