My dad's looking for something similar to this http://www.rei.com/product/745643 but that has suspender-like shoulder straps as well for hiking. I've checked the big name places (REI, The North Face, LL Bean, etc.) and can only find ones with waist straps and a single shoulder strap. If these do not exist, I guess he'll just have to get one without straps and have someone make/attach them himself. Thanks!