Originally Posted by
madpogue
An Ortleib pannier won't keep your lunch from leaking onto your clothes, or your tablet/laptop, or the like.
That's why they come in pairs. Although you could probably feed most of your workmates with an Ortlieb full of chili or soup...
More seriously, I've found a zip-lock bag around a container is leakproof 75% of the time, but the ziplock as the primary container leaks a lot more.