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Best Slime Kits

Updated September 2025
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Pros
Cons
Best of the Best
National Geographic Mega Slime Kit & Putty Lab
National Geographic
Mega Slime Kit & Putty Lab
Fun & Educational

National Geographic is a big name in learning, and this set shows why their name means so much.

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Fun & Educational
Bottom Line

National Geographic is a big name in learning, and this set shows why their name means so much.

Pros

Includes eight varieties of slime and putty, from snotty to glow-in-the-dark and magnetic. Each version has its own tin to keep it clean and ready. A great learning tool that teaches STEM skills. Great for teaching your kids science in a hands-on way.

Cons

Adult supervision is required despite the nontoxic ingredients. Not for younger children.

Squish Original Ultimate Slime Mix'Ins
Squishmallows
Original Ultimate Slime Mix'Ins
Comprehensive Kit

Squishmallow fans will love this pack of 10 ready-made slimes that are themed after the iconic plushies.

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Comprehensive Kit
Bottom Line

Squishmallow fans will love this pack of 10 ready-made slimes that are themed after the iconic plushies.

Pros

This set lets kids experiment with both gooey, glittery slime and soft, fluffy slime. It features eight different mix-ins, including crunchy sequins, soft sprinkles, bumpy beads, squishy mini foam balls, and shredded glitter. Plus, it comes with rubber charms of the most popular mini Squshmallows.

Cons

Some of the slimes are very sticky, and others dry out rather quickly.

Original Stationary Ice Cream Slime Kit
Original Stationery
Ice Cream Slime Kit
Best Themed Kit

This kit comes with everything you need to make themed slime that lasts longer than ice cream on a hot day.

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Best Themed Kit
Bottom Line

This kit comes with everything you need to make themed slime that lasts longer than ice cream on a hot day.

Pros

Comes with different types of slime textures for added sensory play. Each slime can have added scents, such as cherry. Has 31 different pieces, including sprinkles, cherries, and cones, to make the slime look like real ice cream.

Cons

The liquid slime can be a bit too messy for most parents' liking.

Zen Laboratory DIY Slime Kit
Zen Laboratory
DIY Slime Kit
Best Party Pack

This comprehensive slime kit puts your kids in charge of the entire process with everything they need inside the box.

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Best Party Pack
Bottom Line

This comprehensive slime kit puts your kids in charge of the entire process with everything they need inside the box.

Pros

Includes all the utensils, straws, slimes, paper, beads, bags, and balls you need. Promotes creativity by combining all the tools and accessories. Teaches kids basic science and creativity. Includes fun variations like glow-in-the-dark slime.

Cons

Glitter and styrofoam can be difficult to work with.

Elmer's Celebration Slime Kit
Elmer's
Celebration Slime Kit
Best Color Variety

This kit is ideal for youngsters who love to spend hours playing with slime, thanks to its ability to make five exciting varieties.

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Best Color Variety
Bottom Line

This kit is ideal for youngsters who love to spend hours playing with slime, thanks to its ability to make five exciting varieties.

Pros

Makes color-changing, glow-in-the-dark, glitter, colored, and metallic slime. Comes with five activators. Recipes are simple to follow. Non-toxic and easy to wash off surfaces and from fabrics. Made by a recognizable company.

Cons

Some slime didn't turn out as expected. A few reports of missing pieces.

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BestReviews spends thousands of hours researching, analyzing, and testing products to recommend the best picks for most consumers. We only make money if you purchase a product through our links, and all opinions about the products are our own. About BestReviews  
BestReviews spends thousands of hours researching, analyzing, and testing products to recommend the best picks for most consumers. We only make money if you purchase a product through our links, and all opinions about the products are our own. About BestReviews  
BestReviews spends thousands of hours researching, analyzing, and testing products to recommend the best picks for most consumers. We buy all products with our own funds, and we never accept free products from manufacturers.About BestReviews 
How We Tested

We recommend these products based on an intensive research process that's designed to cut through the noise and find the top products in this space. Guided by experts, we spend hours looking into the factors that matter, to bring you these selections.

First Reviewed
November 27, 2021
52
Models
considered
8
Hours
researched
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Buying guide for best slime kits

Cody Stewart
Written by Cody Stewart

Updated September 2025

Ready to buy now? Shop the best: 

Slime-making has become a popular activity for kids and adults alike, combining creativity with sensory play. With the endless array of slime kits on the market, it's easy to feel overwhelmed when trying to choose the right one.

Whether you're looking for a basic kit for young children or something more advanced for creative fun, we're here to guide you through what to consider. From safety and ingredients to educational value and environmental impact, we've got the scoop on how to select a slime kit that fits your needs and keeps the experience enjoyable and stress-free.

Our top choice is the National Geographic Mega Slime Kit & Putty Lab, which comes with eight different slimes and putties plus a full-color learning guide to make playtime educational, too. 

Editors' Picks

Varieties: 8 | Product Dimensions: 7.8" x 2.5" x 12" | Special Features: Includes a full-color learning guide, nontoxic and 100% safe for kids and adults

The National Geographic Mega Slime Kit & Putty Lab offers eight different slimes and putties that promise hours of fun for you and your little scientists. With everything neatly packed in convenient storage tins and accompanied by a colorful learning guide, the kit combines education and play.

As you would expect from a National Geographic kit, kids are encouraged to dive into the science behind each squishy slime while enjoying the various textures and features, like the ever-popular glow-in-the-dark putty and magnetic putty. 

Overall, the experience is worth the money. If your kids are eager to explore the messy side of science, this kit is a solid choice.

Varieties: 10 slimes and 8 mix-ins | Product Dimensions: 12" x 2" x 12" | Special Features: Premade slimes, Mini Squishmallows charms, unique mix-ins

The Squishmallows Original Ultimate Slime Mix'Ins set offers an array of colors, scents and textures that are fun for both children and adults.

The ready-made slimes allow instant enjoyment without the sticky aftermath. The mix-ins, including glitter, beads and rainbow sprinkles, let you and your little ones explore different sensory experiences.

Most people rave about the mini Squishmallows charms, making it a fan favorite. However, others complain that the slime dries out fast. All in all, if you're looking to add some sensory magic to your play, this set is a fun pick.

Varieties: 31-piece kit| Product Dimensions: 10.63 x 7.48 x 4.72 inches Special Features: Multi-scented slime options, Cute ice cream cone storage containers, 100% hypoallergenic

The Original Stationery Ice Cream Slime Kit has a fun ice cream theme, and it's jam-packed with everything needed for a fun and crafty experience.

It features cute storage containers and easy-to-follow instructions making it one of the best options for kids. It comes with 31 pieces, including glue, activator, soft clay, mixing tools, ice-cream-cone-shaped storage containers and more, so kids can start whipping up their favorite slimes right away.

If you're searching for a thoughtful, creative gift, this slime kit might be exactly what you're looking for.

What to Consider When Buying a Slime Kit

Age appropriateness and safety

When it comes to slime kits, safety is the name of the game. It’s crucial to select a kit that matches the age and developmental stage of the user.

  • Age recommendations: Check the packaging for age guidelines. Kits designed for older kids might contain smaller pieces or more complex instructions.
  • Nontoxic materials: Look for kits specifically labeled as nontoxic. This ensures that all components are safe to handle, reducing the risk of skin irritations or other hazards.
  • Allergen considerations: If the user has allergies, double-check ingredient lists for potential allergens. Some kits might have unknown additives that could cause reactions.

Quality and variety of ingredients

The heart of a good slime kit lies in its ingredients. High-quality components can make or break the slime-making experience.

  • Essential components: Check that the kit includes high-quality glue, activators and colorants. These are the building blocks of great slime.
  • Additives and mix-ins: Kits that offer a variety of add-ins, like glitter, foam beads or scents, add an extra layer of fun and creativity. They're perfect for kids who love to personalize their creations.
  • Customization potential: A kit with diverse ingredients allows for endless creativity.

Clear instructions and educational value

Navigating the slime-making process should be as smooth as possible, so having clear instructions is a must.

  • Step-by-step guides: Ensure the kit includes a simple and clear guide. This helps avoid frustration and boosts the enjoyment of slime-making.
  • Educational content: Some kits go the extra mile by including educational materials. Learning the science behind slime can turn this fun activity into a mini STEM lesson.
  • Skill-level appropriateness: Choose kits that match the user's skill level. Beginners might prefer straightforward kits, while more advanced options can challenge experienced slime enthusiasts.

Clean-up and storage solutions

A great slime experience doesn’t have to mean a big mess. Effective clean-up and storage solutions can make a difference.

  • Storage containers: Kits with airtight containers are a lifesaver. They help keep the slime fresh and prevent it from drying out too soon.
  • Easy maintenance: Consider kits that offer easy clean-up. Materials that don’t leave stains or stick excessively are a bonus.

Price point and value for money

When it comes to slime kits, getting the best value for your money is essential. Here's how to ensure you're making a wise investment:

  • Budget considerations: Set a budget and explore options within that range. Kits vary widely in price, so there's something for every wallet.
  • Long-term use: Consider how much mileage you can get out of the kit. Some might include enough materials for multiple sessions, making them more economical in the long run.

FAQ

Q. Are slime kits safe for young children?

A. Yes, most reputable slime kits are made with nontoxic materials and are safe when used as directed. Always check the packaging for age recommendations. 

Q. How long does the slime last after making it?

A. Properly stored slime can last several weeks. Use airtight containers to prevent it from drying out. Kits like the National Geographic set come with storage tins to help preserve freshness between play sessions.

Q. Can slime kits be educational?

A. Absolutely. Some kits include learning guides that explain the science behind slime, turning playtime into a STEM activity. The National Geographic Mega Slime Kit & Putty Lab is a good example, as it includes experiments and fun science facts.

Q. Are there allergy concerns with slime kits?

A. If your child has skin sensitivities or allergies, check the ingredient list for potential allergens like certain fragrances, dyes or preservatives. Opt for kits labeled hypoallergenic or specifically marketed as safe for sensitive skin, such as the Original Stationery Slime Kit.

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