Back when I was an apartment dweller and used to do mobile modeling down at the
FLGS I had a plastic toolbox
similar to this one with all the small hobby tools in the top, larger hobby tools/brushes/glues in the pull-out tray and all my paints in the bottom, separated into sandwich baggies by colors (all reds in a baggie, all browns in a baggie, all washes in a baggie etc). Worked really well for many years, I could keep it in the trunk of my car and had everything I needed to build and paint right there with me or bring it inside and set it up on the kitchen table.
Nowadays I do all my hobbying at home and have a dedicated hobby desk in my room with lamps and airbrush and shelves for paint etc, but if you don't have that luxury I would heartily recommend whatever $20ish toolbox you find down at your local Wal-Mart/Target/Home Depo and some ziplock sandwich baggies.