We have an Adidas sackpack with the outside pocket and it's a great bag. My son will use it for field trips. We have had it for several years.
My daughter gets free sackpacks all the time from cheer competitions but we don't really use them.
My personal opinion is the cord straps can get quite uncomfortable if you wear it for an extended period. I find I am constantly trying to re-adjust where the straps are sitting on my shoulders, then I switch to one shoulder, then the other, then I usually just give it to DH so I don't have to deal with it I would rather have a backpack with comfortable straps.
My daughter gets free sackpacks all the time from cheer competitions but we don't really use them.
My personal opinion is the cord straps can get quite uncomfortable if you wear it for an extended period. I find I am constantly trying to re-adjust where the straps are sitting on my shoulders, then I switch to one shoulder, then the other, then I usually just give it to DH so I don't have to deal with it I would rather have a backpack with comfortable straps.