It seems like you could do this easily with two different things.
Setting up for someone house sitting you can use the dreaded pony club required paper bags. The amount you are talking about will probably work best in a paper grocery bag, which is pretty heavy duty. These will not have to hold up to travel or anything. You can simply put them back into whatever container that you store your grain in, the house sitter opens the container and pulls out one paper bag.
For travel you can do what was suggested above, one larger container and bring a scoop.