There is so much to say at rallies these days that sometimes a single poster isn't enough. These adjustable clamps let you carry two posters on a single pole. They adjust to posters of different sizes and thicknesses up to 25 mm (1 inch) in diameter.

I recommend printing the screws diagonally with supports for extra strength. The main components may need support, depending on your printer.

Print one for the top and one for the bottom to hold your posters steady.