I'm going to give you more of an answer than what you asked for, but here goes...I initially buy powder in 1 lbs canisters. The powder that I decide I like then gets purchased in 8lbs jugs. I keep the 1 lbs canister from the initial purchase and I fill it from the 8 lbs jug. I never fill back into the 8lbs jug from the 1 lbs canister. If I ever accidentally dump the wrong powder into the wrong canister, I've only ruined at most 1/2lbs of two different powders.
Now I leave the powder in the measure between loadings and I leave the canister next to the press. If I switch powder, I put a plastic funnel into the 1lbs canister and dump the hopper into it. Then I tap the side to loosen up any stuck powder, work the action until powder stops coming out. Then I put the lid on the 1lbs canister and it goes back in the cabinet. Never more than one powder on the bench at a time unless its in a dedicated and labeled powder measure (like in my Dillon toolhead).