I lurk here alot and have learned so much from everyone. I thought you could help me with some MYOG ideas.

So, I'm working my from Jeep camping to backpacking, with some canoe camping in the middle. I realize that I need some type of Dry Bag. I went to price them and they are $$$$. Besides, anyone can just "buy" something. Anyone got any ideas on how to make my own dry bag?

I was thinking about contractor garbage bags, but they're really not all that durable and difficult to close, open reclose open reclose etc...

Then I was thinking about those BIG zip-lock bags, but they're not all that durable either.

Any ideas?

Thanks ahead of time.