Interesting. Our (my part of the US) rice is mostly sold in small plastic bags (perhaps 1-2kg), or for some brands hard plastic containers; larger amounts come in either a much heavier opaque plastic bag (like pet/livestock feed, when it's not in a lined paper bag of some kind), or a thin clear plastic bag inside a rough cloth bag. If there are already-vacuum-sealed options here, I've not noticed them.
Reading some other comments, it is also possible that these bags aren't actually vacuum sealed. It is hard for me to tell how much of a barrier you need to get a good sealing, in particular to protect from rice weevils (bugs), which appear to be the biggest issue.
