My buddy's filter element froze up when we when camping out in a 10-degree Sierras weather. My Steripen kept working like a champ. I'm not sure that the instructions are correct though, it doesn't like to start in the water when I hit the button. I could only get a full cycle indication if I had it completely out of the water before I hit the button. Also, doesn't take debris or taste out of the water, just purifies it so you can drink it. Because its a purifier, not a debrisafier or tastefier. My only wish is that they could make the compact version, and still be able to use AA batteries. All in all, this is one of the first things in my pack when I head out.

I put a couple of key rings at the corner and hang it off the back of my pack. Works great. It's tough enough. During one trip when most of the water inside froze, I was able to break up the pieces of ice without fear of puncturing the bag material. Mine is working fine after a year of use. Ridged screw cap great for gripping, can be a little painful when fingers are really really cold. Or maybe I am a just a wuss.

It compresses bags very narrow and you can really crank down the belly straps. My problem was by the logo that sits on the little flap that covers the mouth. That flap ripped when I tightened the strap that connects the mouth and base. I might have tightened it too much, but once you get a little rip, you can't really help but have that seam open up. Thankfully, Backcountry's awesome 100% guarantee covered my ace.

Worked perfect for a recent 4-day outing in the Sierras. Serves dual purpose as as a seat, very comfortable while watching friends work out their counter-balanced bear bag setup. You will appreciate the clear material that lets you see inside. I like that you can operate the lid without needing a coin like some other types of bear cans. Just as easy to use with or without gloves. Works well at both 60-degrees and 6-degrees.