Perfect size bag for those 3  6 hour excursion trips while on vacation.  Can be setup for left or right side carrying, front or back, very versatile.  The strap is very well padded and the underside of the strap is a breath able mesh that runs all the way down the back side of the bag. There are 4 zipped compartments. 1) one close to your back, the space runs top to bottom of the bag, good size, but would not recommend anything that is more than 1 inch thick or hard as it would be against you. 2) Largest Space, again top to bottom of the bag but 3 possibly 4 inch thick items can fit in this space and has a pouch nice for cables in there. 3) This is only about  to 2/3 the size of the bag again for more thinner items, plus has a few slots for items in this section. 4) and last a small  the size of the bag zippered pouch. And lastly a mesh pouch for a water bottle.