Hi,
Silica gel to absorb any moisture that is left in there.
Hi,
My point is there is no moisture left in there (a vacuum sealed bag or squeezed ziplock).
Its not coming from the air cause there is no air.
Its not coming from the bag .
Its not coming from the knife ...
So why worry about hypothetical moisture
I never had that problem but I hate to find out on a 300 to 600 dollar knife and maybe ruin it but that's just the way I think better to be safe then sorry.
Hi,
it is cheap protection, so whatever makes you happy
But you're pretty safe already (probably

).
Dessicants are more of a box thing than an airless bag thing.
People in general (me too) worry about all kinds of things ,
but its just fear of the unknown, lack of knowledge.
i figure why spend time worrying, when you can spend some time to learn
and then know not to worry.
Make simple tests based on "preservation science" and see what your conditions are, what your basic requirements for storage should be.
My experience,
indoor environment is fairly stable,
wood frame uninsulated house,
lowest humidity reading i've seen was 50% (then after humidifier runs 24%)
highest measured was 74% in flooded closet
outdoor humidity is 54-84% (says internet)
I figure average indoors is same range
dewpoint is 40-50 Fahrenheit , indoor temp is always above dewpoint (condensation point).
I have had condensation and subsequent mold but only on windows (mostly in wintertime ) and in the shower/mirror.
Also had some mold on a sealed coat (natural fibers) in a plastic bag in a closet .
Also had mold once unpainted chipboard furniture sitting next to the coldest wall in the house.
I've "stored" carbon steel blades
on the floor, 8inch off the floor, and few feet high on a table,
for a decade
Oiled/unoiled, none rusted none had condensation form.
Only slight patina / greying on unoiled edge.
Never seen any rust until I stored one with wet rubber guard ( chlorinated water)... extremely minor surface rust. Chemical reactions (rusting) are limited by the amount of chemicals.
Also never seen a a mug or glass develop condensation sitting on a shelf or kitchen table.
So,
Ventilate your bathrooms and kitchens keep your indoor relative humidity comfortable for humans,
then keep blades away from windows/sunshine, bathrooms/kitchens and cold walls,
and you don't have to worry about condensation.
Keep blades oiled and you're good.
If an oiled blade doesn't rust in a week just sitting on a shelf,
I says its not gonna rust in a ziplock bag sitting on a shelf for decades (untested

).