The PolyDryer™ Box was designed with excellent sealing and silica gel desiccant to extend your filament storage time. In our internal experiment( an environment of 20℃ and 60% RH), the humidity inside the PolyDryer™ Box changed less than 5% in 30 days. In a comparison test the sealing capability of the PolyDryer™ Box is ~1.5 times that of a DIY storage box.