Hackle, dubbing, thread and beads
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Hackle
Sold as a cape or a saddle, graded by size and colour, and stored flat or hanging rather than in a jar. The feather must not be crushed and the individual feathers must stay findable by size.
Which this shelf cannot serve
A cape is a flat skin. There is nothing flat here, and 59 jars against 275 bottles does not help either. Hackle storage is a box problem.
Dubbing
Loose fibre, natural or synthetic, in dozens of colours and a few grams each. It clings, it compresses, and it is pulled out in pinches.
Which is a small wide jar, repeated
22 PET single wall jars here and 100 containers at 30 mL or under. A dubbing collection is the clearest case in this craft for a set of identical small jars.
Clear matters more than anything
Dubbing is chosen by colour against a vice, and colours are close. 71 clear containers against 79 white, which is the wrong way round for this leaf.
Thread
Spooled, by denier and colour, and the spool is the container. The storage problem is a rack rather than a jar, and the catalog has nothing to say about it.
Beads
Brass, tungsten and glass, by diameter in fractions of an inch and by finish. Tiny, heavy, and they roll, which makes a lidded container non-negotiable.
And they are the one thing here that must not mix
A 2.8 mm and a 3.2 mm tungsten bead look identical and weight the fly differently. Mixed bead jars are the most common and most annoying failure in this craft.
So label in words and numbers, not colour
Diameter and material on the body of the container. Around one in twelve men cannot separate a colour code reliably, and bead finishes are close to each other anyway.
One size of jar, many of them
Which is the same conclusion the model parts property reaches. A tray of identical small jars is a system; a drawer of assorted ones is a search.