The best containers I have ever used are either an old Prince Albert tobacco can, or (deep breath) one of the AK-47 cleaning kit cans that is about half the size of the Prince Albert types and is made of heavier gauge blackened steel. Both have hinged lids with a flat profile which aids greatly in pouring into a measure, and this same flatness makes them easily fit into inner pockets found in most shooting bags . I have several of each type of can, and prefer the military version for most use. These (the AK-type) can be found at gun shows crammed full of cleaning equipment complete with one of the cutest small oil cans you ever saw, in new condition , for around $4 to $7 each. For HC events, you may have to use something else, but for general use, I don't think these can be beaten.