I designed this insert so that an Elite Trainer Box would sit flush on the lid of a target 8" 12.6c Tall Rectangle Plastic Food Storage Container often used for ETB storage. This stops the ETB from sitting awkwardly on the lid, and keeps you from having to store the ETB the other way around. There is even a space left for a silica packet.

Simply print this piece, insert it into the lid of the ETB case, set your ETB on top, and then place the case over the ETB, sealing it without damaging the corners.

Enjoy!