Sawyer’s products are fantastic. So simple and versatile. I prefer the larger filter which is good for a million gallons and not much heavier, but this is a really good deal. The bags are THE way to go in warmer climates. they weight next to nothing and hold a lot of water. the ability to unclog the filter is also really helpful. I am NOT an employee. 
There is something odd about that picture…
No no, nothing suggestive at all, nothing to see here…move along…