Quick answer: Start with a crisp folded paper boat, use a sheet of sturdy paper and keep the bottom symmetrical to help it resist water.
Pick your paper
Ordinary printer paper folds easily but soaks quickly. Slightly heavier paper may stay rigid longer; avoid paper that is too thick to crease.
Fold the base
Fold a rectangular sheet in half, bring the top corners toward the center to form a triangle and fold the lower flaps upward.
Open and reshape
Open the triangle into a diamond, fold the bottom points upward into a smaller triangle and open into another diamond.
Pull into a boat
Gently pull the two top tips apart, flatten the base and adjust the sides so the boat stands evenly.
Test it
Float in a shallow basin of still water. Add only tiny dry weights centered inside if testing carrying capacity.
The bottom line
Start with a crisp folded paper boat, use a sheet of sturdy paper and keep the bottom symmetrical to help it resist water.
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