I carry a Sea To Summit Ultra-Sil 12 x 21 Large Dry Sack in my camera bag. It hides in my LowePro Top loader case that fits my 70-200. In the event of heavy rain or if I am traveling in a boat which I think might sink or capsize I move my cameras into this water tight bag.
This is the ugliest, but the lightest most compact storage sack on the market. It's ultra-lightweight, durable and waterproof.
The Ultra-Sil. Silconized Cordura® nylon resists abrasions, tears, scuffs and punctures. The Polyurethane coating offers the ultimate in waterproofness; waterproof seams are double-stitched and factory-taped for added weather protection Hypalon® watertight roll-top closure keeps contents secure and protected.
At a cost of under $20 it''s a pretty good "insurance policy to have in your bag.
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