I need a smaller version of the foam box to fit in my back pack

here is an optimized box for the Goosky S1 helicopter to be smaller than the origin foam version, and to be able to store up to 14 Battery.

other version should be done to transform some battery tray to storage.

you need :

• 5x magnets (6x2mm) that goes in force in the box.
• 5x M3 washer (mine are 7.8x0.8) glued in the lid
• add some foam if need to support the tail ( not really needed)