As a general guide: 1 liter = 1 gram
You may also refer to the chart beside, this chart does not consider the items inside the packing and the materials being used for packing; but it is a start and will give you an idea of what size silica gel / desiccant packs to use and how much silica gel / desiccant to buy for your purpose.
Just to throw it out there, all our silica gels and desiccants can be reactivated. This is the reason why we include some (if not all) orange indicating beads into the silica gel packets. The main purpose of these orange silica gels are to indicate whether the silica gels have been used (saturated). The way to tell is that the orange beads will turn green.
We do not advise you to reuse silica gels because the process can be troublesome and tedious, but we still want to let you know that our silica gels are indeed reusable.
How to regenerate your silica gels?