I had a 26 qt box of oil once with the plastic bag inside. The majority of the oil drained out of the bag without any real effort on my part.
I had concerns about it also, but after using it, no problem using one again.
As said, depending on sump size, you may need to buy a measuring container (I just used an old 5 qt oil jug) if you don't have a 6 qt sump.
I have 2 vehicles that are 6 qt, so these would work perfect in them, if I ever run out of my stash of oil. Not that I have seen Havoline around here for years.
The price is good also, as said, just a touch more than Supertech syn, but if you need 6 qts, you would have to either buy 2 jugs or a $5.68 1/qt bottle.