if I had to guess, I would assume the nelson rigg bags to be made of a thinner material, than the more expensive bags
say they use 22 and 34 oz vinyl, maybe the nelson rigs use 18 and 20 or something?
if the warranty covers falling over and puncturing them, Id buy and use them without worry.
does any soft bag manufacturer warranty stuff like that?
at that price point, I am very tempted to try them, it is unlikely any of my trips would be ruined by falling over and puncturing a bag.
but I do realize, that would be a catastrophe for some folks.