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Blue diamond-pattern double-wall tumbler, clear lid, straw, side handle
Blue diamond-pattern double-wall tumbler with clear lid, straw, and handle
Blue diamond-pattern double-wall tumbler with clear lid and straw handle
Blue diamond-pattern double-wall tumbler, clear lid, straw, side handle
Blue diamond-pattern double-wall tumbler with clear lid, straw, and handle
Blue diamond-pattern double-wall tumbler, clear lid, straw, side handle
Blue diamond-pattern double-wall tumbler with clear lid, straw, and handle
Blue diamond-pattern double-wall tumbler with clear lid and straw handle
Blue diamond-pattern double-wall tumbler, clear lid, straw, side handle
Blue diamond-pattern double-wall tumbler with clear lid, straw, and handle

Mainstays 40oz Blue Diamond Pattern Tumbler Stainless Steel Double Wall

$21.00 $25.00( / )
Shipping Free.
Key item features Robust Construction: Features double-walled stainless steel construction, ensuring excellent temperature retention for both hot and cold beverages. Generous Capacity: Offers a substantial 40oz capacity, designed to keep you hydrated throughout the entire day. Ergonomic Design: Includes a convenient handle for easy and secure carrying, enhancing portability and...
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Key item features


  • Robust Construction: Features double-walled stainless steel construction, ensuring excellent temperature retention for both hot and cold beverages.
  • Generous Capacity: Offers a substantial 40oz capacity, designed to keep you hydrated throughout the entire day.
  • Ergonomic Design: Includes a convenient handle for easy and secure carrying, enhancing portability and user comfort.
  • Distinctive Aesthetic: Showcases a unique 3D diamond checkered pattern in blue, providing an elegant and stylish appearance.
  • Versatile Application: Made from durable material, making it suitable for use in various settings such as home, office, and while on the go.
  • Effective Insulation: Specifically designed to maintain beverage temperature effectively, ensuring drinks stay at their desired warmth or coolness.
  • Practical Companion: Equipped with a spill-proof lid, making it an ideal companion for commuting, workouts, or outdoor activities.
  • Sustainable Choice: Promotes eco-friendliness by reducing the need for single-use plastic, contributing to less waste.

🚚 Free Shipping & 30-Day Free Returns

Enjoy Free Standard Shipping across the USA and 100% Free 30-Day Returns with zero restocking fees.

📦 Shipping Policy

  • Target Destination: We ship exclusively to physical addresses within the 50 United States.

  • Order Processing (Handling Time): 0 to 3 business days (Mon – Fri). Orders placed after 5:00 PM ET or on weekends begin processing the next business day.

  • Transit Time: 0 to 3 business days (Mon – Fri).

  • Total Estimated Delivery: 1 to 6 business days.

  • Tracking: A tracking number will be emailed to you as soon as your order ships.

🔄 Return & Refund Policy

  • 30-Day Return Window: Items can be returned within 30 days of delivery.

  • 100% Free Returns: We provide a prepaid return shipping label for all eligible returns (including customer remorse, wrong size, or defective items).

  • Zero Restocking Fees: We do not charge any restocking or return fees.

  • Item Condition: Must be new, unused, and in original packaging with all accessories included.

  • Fast Refunds: Once inspected at our warehouse, your full refund is processed back to your original payment method within 7 business days.

⚠️ Damaged or Incorrect Orders?

If your item arrives damaged, defective, or incorrect, please notify us within 48 hours of delivery with photos of the item and packaging so we can expedite a free replacement or instant full refund.

📩 How to Start a Return or Inquiry

Returns are accepted by mail with prior authorization. Contact our customer care team with your order number: