Summary

The sloped upper edge should help prevent small screws put in the back bin, farthest from the handle, from falling out of the bin when case is upright. This would happen to me as that bin is not fully covered tightly by the lid.

See my remix for a front bin, for the organiser here

17/06/2020 - I have now added two files that are longer bins to be used as a pair, instead of a set of 4. One has my slope and the other is just extended, to be used toward the front.

01/06/2020 - V2 has now been added. Now you don't have to sacrifice any storage space, instead of slope the bin now goes straight up and fits tight to the shape of the lid.