I've tried several bags like this. I love how the fabric feels strong but flexible. All the zippers are on one side which is very convenient. Both zippers go to separate large pockets, one with a pocket for a water bottle. The outside pockets are great, one is large for a phone or small items. The other one has a teather for keys and a thin Velcro pocket for a couple cards.
Only downside was the strap it is loose but I ran it back thru the buckle and it works great. Very well thought designed. Love it