We have some of the Pop 18 and 28 packs in stock now. Loaded one up with 60 lbs with the stays up and I was very impressed. For the size of this pack with the stays down it is a real game changer in day pack design. I felt like I could comfortably carry 80-90 lbs no problem with this pack. I own the Guide Light framed Cabinet and it is definitely slightly more comfortable with 60 lbs but considerably more bulky. MR hit it out of the park with the Pop Up series!