Frankly speaking I have got a few sling bags and seldom used them now. When I go college I always having the sling bag crossed by shoulder. This is not only caused me having shoulder pain but uncomfortable feeling as well.
Now I will be checking for backpack more than sling bags or tote. Maybe not as I am looking for smaller sling bag and not those big bulky type. I prefer there is zipper for security reason. My sister always asked me why my bag is so heavy. Yeah it is I do have so many things inside.