I am current in the stage of making a DIY drybox. I have gotten myself a air tight box from supermarket and insert a foam at the bottom to cushion my camera. However, I have a question about the amount of silica gel to be added. Is there a recommended ratio of silica gel amount for camera box ? My air tight box is around 3 litre in volume and Im not sure how muchsilica gel to add. I will be adding hrgrometer soon to measure and maintain humidity ard 40-50% too. Hope someone here able to gif mi guidance. thanks !