I thoroughly researched all sack packs on amazon and settled on this one -  glad that I did.

The strings are sturdy and not too long, the front pocket is nice for storing cell phones because it's got soft padding, and the bag itself is spacious without being bulky. Another plus is the bag material is thick unlike many other sack packs, especially those freebies people hand out.

Only complaint is when closing the bag, you have to concentrate on pulling the strings evenly to both size or else you end up with one side of strings longer than the other which makes it fit awkwardly on your back - I suppose you'd have this problem with any sack pack.

Overall, great product. I recommend it.