I'm posting this link that you might enjoy a short and well done bit of travel writing (gear editor Jeremy White for WIRED). Article just happens to be about a travel bag.
Ah, but there are all different kinds of bags, I hear you cry. Well,
pipe down. I know there are all different kinds of bags. But this one
covers a lot of bases. It can morph into other forms, hold more than
the laws of physics would seemingly allow, and be useful in a whole
raft of situations—so many, in fact, that I have no reservations
feverishly recommending this bag to literally anyone who is even
vaguely interested in luggage of any kind. It is the bag to end all
bags. Let me tell you about it.
Yeah. I have a Filson camera bag. Had it for about 20 years. I understand what this guy's saying.
Filson: 46L bag