UPDATE:

Added new Bottoms with the installation of m3 screws 

for the Version m3 screws: need to drill holes into the bottom 

I tried many DryBox solution, but always have issues with the spools on the rods. So to make it easier, I use extensions for the bearings. 

Requirements:

1x IKEA Samla 22L Box with Lid (Lid with insulation strip)

16x 608ZZ Bearings (22x8x7)

2x 8mm Threaded Rods (320mm each)

Double sided Tape (Adhesion bottom part onto the box)

Instructions:

-insert the top and bottom part together

-insert 2 bearings onto the spool holder each. Tight fit. Might use some strength.

-put 4 spool holders into the rod

-put the rod onto the top part

-with double sided tape on the bottom part, insert into the box