I've decided that the sawyer mini whilst an epic bit of kit is still too heavy. I'm moving over to katadyn liquid to disinfect water. I needed something simple with epic flow to act as a pre filter. Not wanting to use a buff so it had to be bottle based. Took a standard pop bottle, drilled the lid, whacked in a grommet and then pushed some source bladder tube in to which I plunged in an inline petrol filter. Works great. No breather valve needed as air can move freely back into the bottle. Should remove any crud prior to treatment. 30g for the prototype but will get lighter once I trim the tube and go through the mandatory which bottle top is the lightest journey.