I cannot say enough good things about this bag!  We recently took a trip to Greece and I carried it everywhere.  It has a very safe, theft proof compartment in the front, easily accessible for me but not pick pockets, that I carried our passports, some jewelry and money in.  The strap was long enough for me to carry the bag draped over my head and shoulder and was very comfortable.  I put a water bottle on each end, one for my husband and one for me.  They fit perfectly.  I was able to carry everything I needed on a daily basis without it being heavy or cumbersome.  On the plane I added a 2 inch thick book in the main compartment.  I love this bag and will use it on every trip when I feel safety is a must.