I have used Eagle Creek luggage for years and love it's durability and design. It was easy for me to consider Eagle Creek again when I needed a versatile bag for my travels abroad to under developed countries. I also wanted a legal size carry-on (22") that could be taken on the plane, rolled through airports and hotels, yet could also be worn as a backpack for roads less traveled. In comparison to other luggage backpacks, Eagle Creek by far has the most comfortable shoulder straps and waist belt system, not cheap thin straps that I've seen on other back pack type luggage.  When the straps are not is use, they can easily be stowed away in their own zipped compartment. You can clip and/or zip on or off the outer day pack, which also has it's own generous straps, for a lighter day pack option. The buckles and zip pulls are durable as well as the zippers. The internal eye glass pocket on the inside is felt lined with a velcro closure, not flimsy IMO. You may want to consider an extra lock for the inside zipper when the day pack feature is not attached, which it usually covers the main compartment zipper. Overall, I give this bag a strong rating for it's solid design and versatility. Even though the price is not cheap, neither is the luggage. A worthy investment.