Help Any way to transport open SN? How long does the SN last after being opened?

[montanatype]

That's it, I need to carry some SN with me and leave the package at my house, is there any way to do it? Or, like, open it and the SN does not lose its useful life or its effect, or at least, take some zip locks with me and leave other zip locks at my house, idk

 

[quietwoods]

Once you open it, there is no clear point at when it goes bad (converts from nitrite to nitrate due to oxygen exposure). It can be very difficult to ascertain when it is no longer usable. I've seen reports of it taking a long time though.

Even before I open it to test, I am planning on putting the package inside a ziploc, then put that bag inside an airtight food storage container, then put a number of oxygen/moisture absorbers inside the container.

Can't be too safe. The overriding goal is to keep the SN away from oxygen and moisture.