⭐ Best ValueRank #1 in Craft, Slime & Sensory Kits
National Geographic Mega Slime Kit & Putty Lab
by National Geographic · Ages 8+
Researched as the consensus best-overall slime kit: 4 slime types plus 4 putty types (including magnetic and glow-in-the-dark) with a full-color learning guide that frames each as a quick science lesson.
Best price at
Amazon
$31.99
Price checked Aug 18, 2026
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What we like
- ↑8 distinct slime/putty types - color-change, glow, magnetic, fluffy
- ↑Each formula doubles as a viscosity/polymer mini-lesson
- ↑Pre-measured components - almost no parent involvement needed
- ↑Magnetic putty plus included neodymium magnet is the standout activity
- ↑Full-color illustrated learning guide rather than a single instruction sheet
Worth knowing
- ↓One-time use - formulas can't be remade once components are gone
- ↓Some kids find the borax/activator smell unpleasant
- ↓Tray is flimsy; recommend mixing on a real surface
What buyers say
Based on 597 buyer mentionsBuyers praise quality, fun, gift and variety. Some flag value for money.
↑ Quality↑ Fun↑ Gift↑ Variety↓ Value for money
Specs
- Material
- Glue + activator + mix-ins
- Format
- 8 slime/putty formulas + learning guide
- Ages
- 8+
Full buying guide