Keeping some kind of order in an ever growing stash of sewing supplies is a constant challenge. And for someone like me, who is not naturally orderly, it's even more so. My impulse is always to trow everything in one big box. But that modus operandi makes for very annoying work, it's no fun spending precious sewing time rummaging through every box in search for that seam ripper/elastic/button/whatever.
The best system for me is a dedicated place for everything. And with a little help from my dear Dymo label machine and small storage units, I've managed to develop a pretty good system over time. Nowadays Dymo has very hi-tech labeling machines, but I much prefer the look of the old school model that is still sold today. It's a bit cranky and unpredictable, and you need to press with a firm hand, otherwise the letter might come out half done or even blank. But once it's done it creates a great uniform look that doesn't fade over time.