I did lots of research in preparation of buying a travel backpack like this. I needed a pack to bring with me as my only luggage on a trip to South Korea and Hawaii. Boy did this do the trick! With three packing cubes (one fit the whole length of the backpack and the other two fit on top) I was able to pack sufficient clothes, equipment, and thank you gifts (to soon be replaced with souvenirs) without a problem in the main pouch. It was especially nice because of how the pack unzips. It's a bit in between a regular suitcase and hiking pack so was easy to unpack and repack and also stuff it to the brim as needed. Then the additional pouches on the side and front were great for storing small items. One pouch that just has a latch on the front to hold close was perfect for a pair of slip on shoes or rain jacket for easy access.

The only downfalls that I've run into so far have been the mesh on the back of the pack. Any hook (like a bra hook to make a racerback) likes to catch on the mesh and make taking off the pack hard. Also, when the pack is really stuffed there's no chance of using the water bottle pouches. But that's what a day pack is for I suppose!

PROS:
Easy for packing and unpacking
Perfect storage capacity for really any trip (as long as you know how to pack)
Lots of smaller pockets for any small items you may need to access
Zippers are high quality
Feels like nothing when properly latched in (I'm 5'5")
Works as a carry-on on planes even when stuffed (but be ready to do a little shoving)
Beautiful color (twilight blue)
Fairly water resistant

CONS:
Mesh on back panel likes to get caught on things
Water bottle pouch is useless when the pack is full

OVERALL:
I've been very happy with this pack and it has lived up to expectations during a long excursion. It has all the adaptability for whatever you might be using it for. Highly recommend