Magnetic Sensory Bottles

These magnetic sensory bottles are such a fun way for kids to discover how magnets work through hands-on play! Filled with iron filings, paper clips, screws, and other magnetic household items, each bottle gives kids a chance to explore what moves, what sticks, and how the objects react when a magnet gets close.

These DIY sensory bottles are the perfect activity for home, preschool, classrooms, or science centers. Kids can drag the items up the sides of the bottle, gather them into little clusters, or watch the iron filings swirl and spike toward the magnet — almost like magic! But the magic quickly turns into a learning opportunity for kids to practice observation, engage curiosity, and learn early STEM skills.

 

Helpful Tips:

1. Keep the magnet away from the iron filings until they’re safely inside the bottle. Iron filings stick to magnets very quickly, and once they’re attached, they’re almost impossible to remove completely.
2. You don’t technically have to add liquid to these sensory bottles. Since the activity is more about moving magnetic items around with a magnet, rather than watching items swirl slowly through the bottle, dry bottles work well too.
3. Use a disposable plastic spoon for the iron filings. Iron filings can oxidize metal spoons and they’re hard to clean off, so it’s easiest to use a spoon you can throw away when you’re done.

What type of magnet should I use for these magnetic sensory bottles?

A strong magnet, like a neodymium magnet (also known as a “rare earth magnet”), works best for magnetic sensory bottles. Our regular horseshoe magnet wasn’t strong enough to pull the items through the plastic bottle, especially for heavier items like screws.

Neodymium magnets are VERY strong, so use caution. They can snap together quickly if they get near each other, so make sure kids only have access to one magnet at a time.

Many neodymium magnets are small as well, so adult supervision is a must, especially with younger kids. To reduce the choking hazard, you can tape the magnet to a larger magnet wand or another larger object so it’s easier and safer for kids to handle.

What’s in these magnetic sensory bottles?

We made three different magnetic sensory bottles using simple metal items:

Bottle 1: Iron Filings

Iron filings create really cool spiky shapes when you hold the magnet against the side of the bottle. Try collecting as many filings as possible on the magnet, move them around, and then pull the magnet away to watch the filings fall and disperse.

Bottle 2: Paper Clips

This sensory bottle is filled with colourful paper clips, making it perfect for colour sorting! Try grabbing one specific colour, picking up more than one paper clip at a time, or moving the clips from one end of the bottle to the other.

Bottle 3: Screws and Hardware

Our third bottle has random screws and an Allen wrench leftover from furniture building. It’s interesting to see how the different shapes, sizes, and weights move through the bottle when the magnet gets close!

What else can I put in my magnetic sensory bottles?

There are lots of small magnetic items you can add to these bottles. Try one or more of the following:

• washers
• bobby pins
• staples
• pipe cleaner pieces
• springs (some stainless steel isn’t magnetic, so check before buying)
• safety pins
• binder clips
• jingle bells
• coins (depending on where you live. Canadian coins are magnetic, while many American coins aren’t.)

You can also add items that aren’t magnetic, like beads, sequins, rhinestones, plastic gems, or brass paper fasteners. Kids can compare which objects move with the magnet and which ones stay still. You can even test metal items that aren’t magnetic to show that not all metal sticks to a magnet!

What type of liquid should I use in my DIY magnetic sensory bottle?

For these magnetic sensory bottles, we recommend using baby oil if you want to add liquid. Many sensory bottles can be made with water, clear glue, corn syrup, or other liquid mixtures, but because these bottles contain metal, water-based liquids can cause the items to rust.

You can also skip the liquid completely and make dry magnetic sensory bottles. The items will move around more quickly, but they’re still really fun to explore with a magnet and they’ll work in the same way.

Can you make a magnetic sensory bottle with iron oxide powder instead of iron filings?

Yes, iron oxide powder works in a magnetic sensory bottle. It moves around nicely when you bring the magnet close, but the effect isn’t quite as dramatic as iron filings.

Iron oxide is a finer powder, so it looks more like sand as it moves through the bottle. Iron filings create more noticeable spikes and shapes, which makes them a little more impressive for this type of magnet activity.

These magnetic sensory bottles are such a fun way to turn simple household items into an easy science activity for kids. From colourful paper clips and loose screws, to the spiky movement of iron filings, each bottle gives kids something different to discover as they move the magnet around.

These sensory bottles are super quick to set up, fun to play with, and a great hands-on way to explore magnetism through observation and experimenting. Kids can test different objects, make predictions, compare what’s magnetic and what isn’t, and keep learning through play every time they pick up the magnet.

Here’s even more STEM craft ideas:

Magnetic Slime

Bouncing Bubbles

DIY Robot Hand

Where to buy:

You can purchase Low-Mess Crafts for Kids from Amazon, or wherever books are sold:

Amazon | Barnes and Noble | Books-A-Million | Indiebound | Amazon Canada