For long term storage of powders, would it also make sense to include oxygen absorber packets (along with the desiccant)?
Something like this?
300cc (10 Individual Pack of 10 Packets, Total 100 Packets) Oxygen Absorbers for Food Storage, Food Grade Oxygen Absorbers Packets for Food (100 Packets, 300cc) https://smile.amazon.com/dp/B097NCXL3S/ref=cm_sw_r_cp_api_glt_i_ZPFR75T3XA074PS975B7