I think higher but I'm not 100% sure
Answer:
Platypus Gravity Works. ...
Katadyn Hiker Water Filter. ...
Steripen Ultra UV Water Purifier. ...
Grayl GeoPress Water Purifier Bottle. ...
MSR Miniworks EX Water Filter. ...
MSR Guardian Purifier
Explanation:
I look on the internet
What are the factors? If you meant to attach something it's not there.