Terry Spragg ) writes:

This spring I may attempt to make a floating dock out of pop
bottles. 1000 bottles makes 4 tons of bouyancy. I am gathering
ideas as to the best method for construction. I want small
modules to enable easy in - out with seasons that include mucho
ice.

with an underwater "V" section ice should push the floats up.

to make watertight containers for carrying food and camera on river trips I
cut circular seals out of foam meat trays and put them inside the screw on
caps of empty plastic peanut butter jars. to test I half fill a jar
with water, screw the lid on, invert the jar, and squeeze. if no water
comes out its good. this tip is from a book by Bill Mason who made books
and films about canoe camping.

I've also made watertight containers out of small plastic leftover
containers by stretching a ring of bicycle inner tube around the top edge
of the container to act as a seal. I tested these by immersing them in a
rain barrel. I figure bicycle innter tube to be a long lasting type of
rubber seal unlike, say, wide rubber bands. this is not as secure as
plastic jars with screw on lids but is okay for moisture and short
duration capsizes. I bought the leftover containers at a church rummage
sale for a dime each. that's Canadian currency. I don't know what they
would cost in US dollars.

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