I have 2 (qty) of the Lifestraw Universal Bottle Adapter Kits. They are like new and have never been used. I did soak the filters in a bowl of water (supposed to help with the “suction” problem I had read about). I simply prefer a SmartWater bottle with fliptop cap and my .

The carbon filter plus on of the caps weighs 2.9 ounces.

Cost is $15 per kit or $25 for the pair.

The product can be found here. My photos are below.