I've been using this filter for a year now, really happy with it. I use it both as an inline-filter when attached to my dirty waterbag, as as a gravity-filter to my clean water drinking bladder that is inside my pack. The only downside for me is its "lenght" at 19.5cm I've had difficulties finding a "small, but large enough" pouch to keep it "clean" from dirt and "not leaking into my pack" inside my backpack when not in use.

If every ounce of weight counts this is my go to water filter system with big zip Evo bladder. Downside is not having a filtered water bag for making coffee or boiling meals. I'll use this when I have clean glacier water to drink and not concerned about boiling my water for a long period when making coffee or freeze dried meals.