Bucket of Rice

I had bought a 25# bucket of emergency food rice a year or so ago. It wasnt individually wrapped, but just a big bucket o' rice. Kinda ticked me off cause once I open it, its pretty much exposed and will probably waste a lot.

Been thinking about opening it, to vacuum seal some more reasonable portions for emergency use.

If I opened it to vacuum seal smaller portions, what should i do to better ensure it's longevity storage, especially since I will break the seal on the bucket?

FWIW: this brand is a common emergency food bucket supplier, and everythign else I have purchased has been in reasonable proportions. I wasnt expecting it to be 25# thrown in the bucket. Kinda disappointing.