There are of course lots of options for storage boxes both online and in stores everywhere. Most suffer from the same problem though, they break. Sooner or later that cheapo plastic box you use will crack, the lid won't fit right and it will end up in the bin.
I have used these Really Useful Boxes for years now and do not consider anything else any more. This large box has two very handy inserts with different sized compartments which makes great use of the space. These fit perfectly and can be removed.
The box, lid and clamps are all very strong. You could stand on this thing with no real concerns about it. They stack and store really well.
The extra money is well worth it.