Really tried to find a day type pack for photo outings and vacation. Wanted a comfortable pack that didn't feel or look either big or cumbersom . First ordered a Thule Crossover at $99.00 and found it too much bag for my needs. The material was very, very nice, durable and all it's cut out  to be. However, the strap was rather large as it came over my shoulder looking a little industrial and not all that comfortable. I believe it would be easily up to the task of an extensive field hike though. Large enough to hold a good deal of items and hold up like iron. Next:....on to the "Patagonia Atom" sling bag. I thought this was going to be the best for me. The Pack has a mesh material that keeps you dry and comfortable. It includes a crossover strap to stabilize the bag and keep it from flopping around. It could hold alot for the size of the bag but the strap didn't quite feel nice enough. It did have a honest number of pockets and would be very nice for most people. I finally ordered the Urban Sport Polyester Multiple Compartment Messenger Cross Body Outdoor Biking Backpack in black/gray. Really a nice color. While this is a sling bag, I assumed that it was a two strap backpack.  The sling turned out to be perfect. Jan Sport really knocked  this out of the  ball park. The primary compartment will hold a good deal of items although it does not have smaller organizer pockets, the many outside organizer pockets compensate for this shortfall.  It has a comfortable strap and fits like a glove. Has a good sized main compartment and great organizer pockets on the outside. The strap quick disconnects in the mid front and makes it really convenient.  The strap is quite comfortable as it loops over my  shoulder without issue. It bas a water bottle holder on one side and another pocket on the other that can also be used for a water bottle. The back has A mesh material that keeps you dry and comfortable. The zippers are smooth and without issue.  You just can't beat this for the price!!