I think that using the storage boxes uses up the least amount of room. I use them for my bobbins that I never wind a bobbin until I am ready to use that color. I keep my whole skeins in quart baggies.
I have a large collection of flosses that I acquired from gifts, garage sales, etc. I used to keep a small case with bobbins for each project. Therefore, I have many of some colors and little or none of others.
If I could start afresh I would go for the little baggies. That way I would be able to see exactly what I have available. It would make selections easier when I want ignore suggested colors and go for my own choice.
I would definitely not recommend the DMC bow system. It is difficult to keep neat. I spent a lot of money on this system. On a scale of 1 to 10, I would rate it a negative ten. Could have spent that money on more floss instead!!!!
I've seen the baggies at craft stores. You can order them from this site.