I use small fishing lure boxes to hold bobbins for my various sewing machines; they are 2 sided and have lots of compartments. I bought my dd a large fishing tackle box to use for all of her sewing supplies.
I use a round chopstick for a spool holder
on my machine that doesn't have one. Empty pill bottles hold filled bobbins for taking to classes or quilting bee. A wheeled scrapbooking case for toting some of my sewing machines.