Lo-Fi Games

I am trying to restrict a backpacks inventory to just hold specific items (medical backpack, just holding meds). In the building category you can find the easy to mod "limit inventory" option. The medicrate for example does exactly what i need, but it is in the "Building" category.
Is there any way i can make this work for backpacks? doesnt even matter which kind of backpack..
thanks for you help

it only works for buildings.