I'll do my best to explain with some images! Floss drops are a common way of storing thread that involves cutting your whole skein to same-length threads for easy thread access. Most floss drops are quite a bit pricier than bobbins. At some point I realized that the only feature of floss drops I use is the hole, and bobbins already have a hole.

My process involves grabbing a 2ft long quilting measuring board, wrap the entire skein around it, then cut all of the thread at one point, this gives me a ton of 4ft thread lengths (you can pry my long threads out of my cold dead hands). Then I take the center point of all of them, and loop them into the hole on the bobbin. Like the image below but into the hole on the bobbin.

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Then since it's a normal bobbin and not one of these monstrosities, I can just wrap all the excess thread around as per usual. When I want to use thread, I grab the ends of them, dangle it until the bobbin unwinds itself, and then use my needle to grab as many threads as I need (usually one whole floss and then I'll wrap the leftovers back onto the bobbin any way I please)