I use a highly sophisticated system that involves tossing all small parts into an old plastic jig saw box (about 12" x 12" x 4"). It's been in the family for about 35 years; started by my dad. When he sold his last boat, I interited the "box". Whenever I buy a screws or nuts or "stuff", I buy a couple extra and toss them in. When I have to do a job, I rarely need to look far for an appropriate factener,
shackle, washer, or doodad. Larger stuff is stored in baby wipe boxes, sorted by type (electrical, plumbing, woodworking, and a dedicated hoseclamp box).