I know there is a lot of discussion in the Rick Steves world about the right daypack to carry, what to carry in it, etc., and I certainly have seen a lot of people carrying a lot of different types of daypacks on my trips to Europe. The last several times I went to Europe, however, I didn't carry a daypack much at all. I thought about it - when I trek from the suburbs to the inner Houston area for the day on a Saturday, to go to museums, the zoo, lunch, the park, etc., do I carry a daypack with me? The answer is no. So I asked myself why carry a daypack when venturing from my hotel in a European city to see that city's sights? I can see in the past why this got started - people carried around big bulky cameras, guidebooks, translators, currency converters, etc, but when all those functions can be found on my smartphone that fits discretely in my pocket, is it really necessary to carry a daypack like a security blanket every day? Now I generally leave mine in my hotel room when I am out exploring a city, and I don't have to worry about the bag getting stolen, or accidentally leaving it at a cafe, or having to worry about checking it at a museum, etc. I have also found that I don't look like a tourist this way, so I get mistaken for a local all the time.
Now I do use my daypack if I am taking a little daytrip out of the city I am staying in, out to the countryside or something like that, just like I would take a daypack when going for a day hike in the countryside outside of Houston. My choice for that is an old classic - the Jansport Superbreak in black. I like that it is small and folds up easily, and isn't overly complicated, just two compartments - the main compartment and a small outer pocket. I like that the design is simple and doesn't have a lot of ornamentation or call attention to itself.
Now I am not saying there is anything wrong with carrying a daypack around a city with you, or that my way is "better", not at all. Just bringing this up in case someone else might want to think about whetehr they really need to carry theirs around with them.