Skip to product information
In stock
MADE IN THE USA
Most of our products are made with love in the USA.
HAPPINESS GUARANTEE
This product is backed by our 100% Happiness Guarantee.
At Mallard Moon, we deliver high-quality gifts designed to bring joy and connection. If for any reason you're not 100% satisfied, just reach out. We're committed to making it right, or we'll gladly take it back.
READY TO GIVE
All our products are presentably packaged for hassle-free gifting.
SHIPPING INFORMATION
Estimated delivery times:
US: 5-7 business days.
Canada: 5-9 business days
Australia/New Zealand: 5-9 business days
UK & EU: 5-7 business days (ships from Amsterdam)
Rest of the world: 2-4 weeks
*addition 1-3 days lead time for personalized products
Please note: We currently do not deliver Canvases to PO Boxes as UPS does not deliver to PO Boxes, so please provide a different address that we can ship to.
Meet the playful, practical tumbler crafted for the sister-in-law who brings humor and heart to every gathering. "They Call Me Sister-in-law Because Partner In Crime Makes Me Sound Like A Bad Influence." This 20oz or 30oz tumbler blends everyday function with personality, turning daily coffee runs or tea breaks into moments of fun.
- Size & Capacity: Available in 20oz and 30oz to fit most cup holders and beverage needs.
- Material & Finish: Stainless steel with a sleek black powder coating for durability and a modern look.
- Insulation Technology: Double‑wall vacuum insulation keeps hot drinks hot and cold drinks cold for hours.
- Engraving: Laser-engraved in our workshop—permanent, fade‑proof design (not printed or vinyl).
- Lid: Clear, spill-resistant lid included for on‑the‑go sipping.
- Care: Hand washing recommended to preserve the finish and engraving.
- Cup Holder Compatibility: Fits most cup holders for use at home, in the car, or at the office.
- Gift-Ready Appeal: A humorous, thoughtful gift for Christmas, birthdays, or “just because.”
This tumbler delivers more than temperature control. It provides a dependable daily companion that celebrates a special sister-in-law bond with a wink. The durable stainless steel construction stands up to daily use, and the laser engraving stays legible and vibrant over time. Whether you’re shopping for a Christmas gift, a birthday surprise, or a lighthearted “just because” moment, it’s a practical keepsake that pairs function with personality.
