Magnetic Straw Caps

Magnetic silicone covers designed for a secure fit on many reusable tumbler straws.

  • Fits Many 30–40oz Tumbler Straws
  • Designed for a Secure Fit
  • Helps Cover the Straw Opening
  • Stylish • Durable • Reusable
  • Fits many 30–40oz tumbler straws
  • Helps cover the straw opening from dust
Choose Your Pack — from $7.99 Shipping & returns — see policies Shop Straw Caps collection

Secure Checkout

Pearl white and black magnetic silicone straw cover caps shown on reusable straws and a white 40oz handled tumbler, demonstrating the magnetic closure and fit for 10mm–12mm straws. Pearl white and black magnetic silicone straw cover caps shown on reusable straws and a white 40oz handled tumbler, demonstrating the magnetic closure and fit for 10mm–12mm straws.
Select Quantity

Select Quantity

1 Pack
$7.99
2 Pack
$12.99 $15.98 Save $2.99
3 Pack
$17.99 $23.97 Save $5.98

Unit price $7.99 · Bundle & Save discount applied automatically — price shown is your final total.

Shop Pack — $12.99

See our Refund Policy

Black stainless steel tumbler with angled reusable straw and magnetic silicone straw topper hovering above the opening, demonstrating leak resistant straw protection and magnetic attachment for 10mm–12mm tumbler straws during travel and everyday use.

Helps Cover Your Straw On the Go

Our magnetic silicone straw cap helps cover the straw opening to reduce dust and everyday debris. Designed to fit many reusable straws within about a 10mm–12mm outside diameter range on 30–40oz tumblers.

Shop Magnetic Straw Caps
📦 U.S. shipping available
↩️ 30-day return policy
🔒 Secure Checkout
🔄 See Refund Policy for exchanges

Designed for many reusable tumbler straws

Compatibility depends on your straw’s outside diameter and shape. Measure your straw before ordering.

Pearl white, black, and more — same magnetic straw-cap design

Pick Your Straw Cap Color

Magnetic Silicone Straw Cover Caps for 40oz Tumblers – Leak Proof Straw Protectors
$2.00 sale
Pearl white and black magnetic silicone straw cover caps shown on reusable straws and a white 40oz handled tumbler, demonstrating the magnetic closure and fit for 10mm–12mm straws. Close-up of a pearl white magnetic silicone straw cover cap for 40oz tumbler straws, designed to help protect drinks from dust, spills, and debris.
Magnetic Silicone Straw Cover Caps for 40oz Tumblers – Leak Proof Straw Protectors ™ $7.99 $9.99
Keep your tumbler clean, protected, and spill-free with this leak-proof silicone straw cover designed for 40oz tumblers.Built for everyday use, this reusable straw cover helps prevent messes while protecting your drink safe from dust, dirt, and germs. ✔ Key Features Leak-proof seal helps prevent spills, splashes, and leaks Protective design keeps straws clean from dust, dirt, and germs Durable food-grade silicone for long-lasting daily use Reusable and easy to clean – simply rinse or wash Snug, secure fit designed for most 40oz tumbler straws (10-12mm) Magnetic attachment allows the cap to stay connected when not in use ✔ Perfect For Travel and commuting Gym sessions and outdoor activities Work, school, and daily hydration Keeping drinks clean on the go ✔ Compatibility Designed to fit most 10–12mm straws, commonly used in 40oz tumblers and similar large drinkware. ✔ Why You’ll Love It This silicone straw cover is a simple upgrade that makes a big difference—keeping your tumbler cleaner, reducing spills, and adding convenience wherever you go. Fits most 10–12mm straws used in 40oz tumblers, including popular insulated tumblers for everyday hydration and travel. Pair with a tumbler:Shop our 40oz insulated tumblers with handle for the perfect match.
View all Straw Caps