If you're going through a bunch, why not refill 'em?
They sell adapters like this: http://www.mrheater.com/sporting/propane-tank-refill-adapter-1385.html that allow you to recharge them from a standard tank. Won't fill them completely , but carrying two small half-full bottles has to be easier than carrying a big 20-lber in some fishing circumstances, and it's got to save money in the longer run.
Ebay has lots of options: http://www.ebay.com/bhp/propane-refill-adapter
They sell adapters like this: http://www.mrheater.com/sporting/propane-tank-refill-adapter-1385.html that allow you to recharge them from a standard tank. Won't fill them completely , but carrying two small half-full bottles has to be easier than carrying a big 20-lber in some fishing circumstances, and it's got to save money in the longer run.
Ebay has lots of options: http://www.ebay.com/bhp/propane-refill-adapter