Mouse Gears is the MEGA Disney merchandise store in Epcot (in Future World). Towards the rear of the store, they have a very small candy section. Fill a bag type candy. The bags are really sturdy thick plastic (heavier than average ziplocks), their really long and have a ziplock closure.
I LOVE those Kringla Pretzels from Norway. They fit perfectly in the bag and stay fresh for hours. I take them for a snack for the airport many times. I usually eat it on the bus ride to the airport
They're just handy if you want to take a pastry "to go". The bakeries don't really have "to go" containers. They'll put a pastry between two plates and put it in a bag. It won't stay fresh for long.
Epcot offers so many good snacks there's no way you can eat them all in one trip and NOT get sick.

We always take something for later or even breakfast the next morning.
I'd plan a morning in Future World, then head into World Showcase just as their opening at 11am. Have lunch at 12 noon then grab your goodies to take back to your room.
Enjoy! Everything is delicious in Disney!