That's a sock (cushion sole, OG green) filled with cans from C Rations.
How else do you carry a bunch of cans without clanging and bruising yourself
as they bounced around in your cargo pockets?
You can carry rice inside a sock if it's in a plastic bag such as battery wrapper for
the AN/PRC-25 and 77 (also famously used to cover the handset in the rain) or a
"chieu hoi" plastic baggie magazine pouch. It won't tolerate immersion, but it keeps the rice reasonably stored. After all, you are only looking at about a week or so.
I used to carry rice in a baby bottle, with an airtight cap.
You can cook it in a canteen cup, but you need to put some kind of cover over the top during the simmering phase.
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