someone posted about the UV filters being unreliable - that may deserve a second look as the steripens have undergone some serious upgrades in the last year and are more reliable in battery life and purification performance. that being said, i don't use them either. I use the aquamira frontier pro in a gravity configuration with chlorine treatment, as outlined by Jason Klass on his site - that method of double treatment comes in at about 5oz when you consider the filter, hose, and tablets or chlorine drops, and covers everything for about $40