2070 improved version The improved version of 2070 is based on buyer feedback on older models. Buyers reported that the disadvantages of the old backpack are that it is too heavy, and the horizontal opening of the main bag is too small, which is very inconvenient to load. So we reduced it to 3.68 pounds and changed its main pocket opening to a U-shaped opening. Its a heavy backpack that can carry a lot of items and is the perfect choice for travel. It is also perfect for outdoor sports, mountain camping, etc. It is convertible. If you purchase this backpack, we will give you an extra shoulder strap that can be adjusted to a maximum of 58 inches. You can use it as a crossbody bag if you need it. It has a sturdy handle on the side, and you can hide the shoulder strap of the backpack if you want to use it as a luggage bag. If you have any suggestions for this backpack or other backpacks, please contact us and thank you for your support of KAKA backpacks.