Roundup S2 4 Gal. Backpack Sprayer

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1. they are crap. I've bought 2 in 2 years. May have used the first one 5x's. Never left any liquid in the sprayer, after I used it. Never used anything other than car wash soap in either sprayer.
   The 2nd sprayer I used approximately 10x's.
   You can go to Harbor Freight and purchase a backpack sprayer for half of the price of one of these and actually get more use out of it.
   They are JUNK.
2. What are the differences in this model and the Roundup Pro backpack sprayer?
3. the name roundup is like the forbidden sprayable poison roundup oops