Is it because spaghetti never goes stale?

是因为意面永远不会坏？

Same thing with bags of flour. You aught to be able to keep the bugs out without buying another container.

面粉袋同理。你本该不用再买一个容器就能防虫。

Shouldn't all food products be resealable in their original package?

所有食品不都该能用原包装重新密封吗？