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No water required. Simply 'flipping' up the bottom flap and folding down the top flap creates a self-sealing envelope.
Top window is 3 ¾ x 7/8"
location is 3/8 from left 2-5/16" from bottom
Bottom window is 3 ¾ x 15/16
Location is ¾ from left and 11/16 from bottom