millbank bags?

[Midnitemo]

i could buy a bag of charcoal but that takes up valuable space /weight in my BOB if space and weight wasn't an issue i'd have pre built a baby berky using a single candle and brought that along....i have sand nearby and i'll make my own charcoal the two drum's of my cache will become water carriers/storage and i have 2 ltr poly bottles in the BOBS to make filter housings ..the millbank is just belt and braces first line filtration...works perfectly for my plans....if i can find a couple good ones