It;s great to have both hands free, but there are design flaws.
I had been using the tote bag with a shoulder strap that came with my G3 for about two weeks and was having trouble doing tasks like cleaning the pool and just about anything else that requires two hands.  Even with the shoulder strap the unit seemed bulky, heavy and in the way.<br />I was delighted to see this backpack and even though the price was very high, I could see how this would help me to be more active and mobile.  I received it today, and took it to the gym to walk on the treadmill and was pretty pleased.<br /><br />The G3 fits snugly in this bp and took some effort to pull the material around the top of the unit.  Once in it's in though!  Some reviewers have stated that the unit slides down into the space below, but I found that the square support sides and the "shelf" with heavy duty velcro to hold it in place worked fine. The zipper to access the storage compartment gets stuck, really stuck and I'm afraid I'm going to have to send it back for a replacement  I dont want to be needing my replacement battery and having to fight a zipper as I'm running out of oxygen!<br />  I used it only with the double battery attached to the unit and left the storage space empty and although it was easier to carry and the weight was distributed properly, it got pretty heavy after about 15 minutes walking on the treadmill.  Can't imagine toting around another double battery AND charger.<br /><br />Pros<br />Much easier to carry than the shoulder bag<br />Backpack straps are easy to adjust and are wide and nicely padded<br />Comes with a sturdy rubberized handle to use when not on your back<br />Mesh pocket on the sides for easy access to a water bottle<br /><br />Cons<br />Storage area zipper is defective<br />Chest strap and waist strap are not removable.  Waist strap is big and bulky<br />Seems like it will take some doing to swap batteries.  The unit either has to come out or the velcro shelf has to be removed and repositioned
Rating: 3 stars