I just purchased the
LLBean Stowaway Day Pack for a trip to italy/greece/cruise coming up later this summer. I had been looking for months for something very very light, packable (smushes up into its own little bag), but had lots of pockets for organization.
It's not the cheapest option out there (I found a comparable size/weight bag on amazon for half the price), but it ticked all of the boxes for what I wanted and I've always been a fan of LL Bean's quality.