Definitely affordable option, if you are going on known long term sailing then I would carry the KATADYN SURVIVOR 35 (sometimes you can get good deals off of E-bay) but definitely SeaPack would be great for the BOB than a heavy 10 lb KATADYN SURVIVOR 35. And Bear G won't be happy because if will allow you to filter and drink urine.
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Failure is not an option!
USMC Jungle Environmental Survival Training PI 1985