Leak Proof Bag Science Experiment for Kids

This leak proof bag science experiment is sure to WOW your kids! All you need is two household supplies and you can do this water experiment with your kids too.

This post contains affiliate links.

Lately, the kids and I have been doing lots of neat science experiments. They both love them and even ask if we can do another science experiment all the time. Some of our favorites have been this lava lamp experiment and this cloud in a jar experiment.

*Note: This science experiment should be done with adult supervision at all times.

If your kids are into science experiments too, stay tuned to the blog because we have lots more planned. But for now, check out these super cool leak-proof bag experiment!

Leak Proof Bag Science Experiment

Much to everyone’s surprise, the bag won’t leak! This is because the bag is made of a polymer – which is long, flexible chains of molecules. When you poke the pencil through the bag, the molecules spread apart and then seal themselves around the pencil. It’s really cool!

My kids would do this for a long time if we had enough pencils. They just think it’s so cool that they can poke the pencils through the bag and it won’t leak.

If you are wondering what age this experiment is for, I will say that my 3.5 year old was able to do it no problem and as you can see she really enjoyed it. As always, supervision is required though.

Supplies Needed:

As an Amazon Associate I earn from qualifying purchases.

• Gallon size storage bag
• Sharpened pencils

1. Fill a gallon size storage bag about half full with water.
2. Poke a pencil straight through the bag – in one side and out the other.

That’s all! Do this over and over again for lots of amazement.

If you do this with your kids email and let me know. I bet they will love it!

Check out these other cool science experiments!

25 Science Activities for Preschoolers That are Totally Awesome

Growing Plants Science Activity