Do two identical magnets have double the force (from one)?

If one magnet can hold on, say, five lbs of water, do two identical magnets have the power to hold ten (if we hang it from them, in a bucket, tied to a rope)?
I would think yes, but I have no way to research it (other then pulling one, and then two, off of a iron surface, but that is hardly scientific).
And since magnets are so mysterious to me, I thought they may act different from what I expect them to do.

Any magnetist Jellies around?