@warto thanks for reaching out! In addition to the information @REI-EricP provided, when you're looking at backpacking packs on REI.com, along the left side of the search, you can select different options to search by, one of those being "Pack Loading." If that front-zip option is really important to you, this search criteria will help narrow your choices. You can also select, under "Features," the option for a sleeping bag compartment. Hope this helps!