How to Make a Waterproof Bag

Written by rowan wood
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How to Make a Waterproof Bag
Waterproof bags can protect your belongings from water damage at the beach. (Island Arrival image by msw from

Keeping things dry can be an important part of your day at the beach. Many beach bags are not truly waterproof, and heavy use won't make them last to see another summer. Purchasing a new beach bag every year can be costly and wasteful, especially when you know it could get dirty, wet and full of sand. Crafting your own beach bags at home with waterproof materials can assure you that your bag will stand the test of water, sand and time.

Skill level:

Things you need

  • Garbage bag
  • Duct tape
  • Scissors
  • Cotton cord

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  1. 1

    Make the garbage bag into a flat sheet by cutting off the bottom of the bag and cutting it down one side. Unfold the plastic sheet and lay it on a flat surface. Temporarily tape the sheet in place so it doesn't move around. Draw a rectangle 16 inches wide and 30 inches long on the plastic, leaving 1-inch margins all the way around.

  2. 2

    Cover the rectangle with slightly overlapping bands of duct tape, working within your drawn margins. After covering the whole rectangle in duct tape, cut along the drawn lines and flip it over so that the tape side faces the table.

  3. 3

    Take a two foot piece of cotton cord and lay it over one of the shorter ends of the rectangle. Fold the edge over the cotton cord and tape it in place. Repeat on the other side of the rectangle with another two foot length of cotton cord.

  4. 4

    Fold the rectangle in half so that both cotton cords are touching. To form the bag, tape each side together with more duct tape. Tie the cords together on either side to create the drawstring.

Tips and warnings

  • Use coloured duct tape to customise your bag.
  • Draw designs on your bag with permanent markers.
  • If your bag tears, repair it with more duct tape.
  • Experiment with this technique by making bigger or smaller bags with different types of cord.

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