I got mine form a local outfitter store. It stay in my emergency kit, weighs next to nothing. Never use it except emergencies. But for regular use you should try the Sawyer bottle filter. You can fill the bottle, then drink form it. It basically is a straw in a bottle. It works. I bought one last year and used the filter in the bottle for my gravity bag, and it worked great. I make camp water for everyday use so I don't have to do it everyday. I'll buy a replacement filter to put back on the bottle this fall. The bottle is nice and has a pop up drinking tube on it. It's around $30.