How to Make Your Own Giant Water Blob

With the weather hot enough to be uncomfortable, we’re always looking for ways to cool off. One of my favorites when I was younger was the giant water blob. They are very easy to make and the materials are inexpensive and easily accessible.

What you’ll need:

  • Plastic sheeting (You can find this in the painting section of home improvement stores or online)
  • An iron or straightener
  • Parchment paper
  • Tape
  • Food coloring or other additives (glitter, small toys, etc), if desired


Determine how large you want your finished product to be. You can make it as big as the plastic that you have, but it can get somewhat cumbersome. If you have a smaller child, they are happy with a smaller version of it. (Just remember, when you cut the plastic that you will be folding it in half, so cut it twice the length of your finished blob.

(We decided to make a medium-sized one that would fit well on the deck)

Next, using the parchment paper as a ‘shield’ between the iron and the plastic, seal all of the edges of the plastic. It helps to do this on a smooth surface. If you do it on an uneven surface, it can fail to seal completely and you’ll have small leaks.

Note: Make sure you keep the parchment paper between the plastic and the iron at all times.

Leave a small opening to insert the hose and your coloring and additives. If you’re adding anything, add that first. We just used blue and green food coloring. Then, insert the house until the plastic is taut and ‘full.’

Cover the opening with tape, and there you have it. Alli decided it was a bed for mermaids. And, it does seem like something a mermaid might sleep on. Maybe next time we’ll add some glitter.

Note: If left in the sun for too long, it can get very hot. Make sure you check the temperature on subsequent days to make sure it’s not scalding. It can be cooled by letting some water out and replacing it with more cold water.