Originally Posted by
KMPete
I always use a bag with zipper (much like those in your photos) and I've never had an issue at any airport, normally they don't even give it a second glance. I think all they really care about is being able to see into the bag so that they can make sure nothing is over the size limit.
Correct. There is no requirement that the bag be water tight.
They want to see the contents and have everything in one place generally speaking.