Yes you can't go wrong with the Guyot stainless bottle, I own 3 myself (1 for work,1 for BOB,1 for traveling). You can boil water in them with no problem and they are built solid. They will also directly screw in to my water filter and MSR dromedary bag yet wide enough mouth to put the steripen in. I think the steripen may work even better in the ss bottles because of the reflectivity of the UV, but it's speculation. I've had both nalgine and ss (stainless steel) and after drinking water out of a ss, I'll never go back. Definitively better water taste for me and my water stays colder longer as well. It is also a non insulating bottle so you can boil water in them. I've done it on a electric stove, a fire, a camping gas stove and with a propane torch. Guyot is also a great company to deal with as well, I've had a lot of positive experience with them and continue to buy from them.