The Iron Chests from this mod can be packed, but not unpacked - a tooltip appears saying that the chest cannot be unpacked in this location, regardless where I put it.

'>_< I'll take a look after I get home. Although if it's what I think it is, I'll poke the Iron Chests people to implement that function correctly... ;P

v0.7.3 is being reviewed and will be available in a few minutes.