I put mine in a glass bowl with an air-tight lid. I recommend putting it in a bowl that's deeper so that the lather doesn't spill out over the sides while you're loading your brush.
The air tight lid is recommended by some and others say it's not necessary. I chose to go air tight but many gents have not and I have not heard of any one's soap going bad.
By all means, get it out of that chincy red tub (which I might add isn't exactly air tight). You'll find a wider container will make brush loading easier.
TOFLAC-U, AOM, LEMS/ Stay back! I have a Merkur, and I know how to use it!