I've started packing and want to make some room. I have a cereal box that has never been opended, but I want to open the other one and put the contents in a smaller, see through plastic bag or container. Does it matter if I put the contents in another bag or container or does it have to be in the orignal, unopended box? If I bring ground coffee in a paper bag is that okay, or does it have to be in an oringal, unopended container, like from a brand like Fodgers?

All of this will be in my checked luggage bag, not my carry on.

Also, what about items like pans or plastic measuring cups, small bowls, are these allowed in baggage?