Looking for a mug with a secure lid that doesn't leak....has anyone who has purchased this cup had issues with leaking?

I hope someone talked you out of this mug. The lid does NOT screw on, so when a hot beverage is in the mug, steam builds up (because you have the lid all closed to prevent spillage) and bam! Off flies the lid spilling very hot drinks! With cold drinks there is no problem. The lid is secure. In fact it is hard to remove unless you open the drinking part for air to release the suction!

How many ounces of liquid will the 20 ounce tumbler actually hold?

It holds only 16 ounces! With the lid in place, 16 ounces of liquid comes right up to the bottom of the lid. I did measure it with a measuring cup (twice) just to be certain. It will hold 20 ounces only if you fill it right to the rim. This seems to be the case with EVERY stainless steel insulated tumbler available for sale under every brand I have tried, and it's very aggravating. I'd like to find an insulated tumbler that actually holds 20 oz. with the lid on!

Does this have a non slip silicone base?

No it does not but I like the cup.

Do yeti lids (with the magnet slider) fit this tumbler?

The Yeti mag lids do fit this tumbler. I prefer the magnet lid as its easier to clean. You can purchase separately (either Yeti or generic). I bought the generic lid and it’s identical except it doesn’t say YETI on the magnet.

Sunwill Coffee Tumbler 20 Oz Insulated Travel Mug Stainless Steel

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Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

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€ 45.67

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Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

☕ Elevate your sip game—stay hot, stay cool, stay unstoppable.

ECO FRIENDLY EASY CARE - Reusable, dishwasher-safe, and lead-free—make a sustainable choice without sacrificing style or convenience.
CAR CUP HOLDER COMPATIBLE - Sleek 20 oz size fits snugly in your car’s cup holder—stay fueled without missing a beat during your daily grind.
DURABILITY MEETS ELEGANCE - Crafted from premium 18/8 304 stainless steel with a powder-coated finish that resists scratches, fading, and dents—built to last and impress.
SPILL PROOF ON THE GO DESIGN - BPA-free sliding lid with silicone gasket ensures zero leaks and easy sipping, perfect for your busiest commutes and outdoor adventures.
UNMATCHED TEMPERATURE CONTROL - Double-wall vacuum insulation locks in heat for 6+ hours and chill for 24 hours—your drink’s perfect companion all day.

The SUNWILL 20 oz Coffee Tumbler features advanced double-wall vacuum insulation to keep beverages hot for over 6 hours and cold for up to 24 hours. Made from durable, food-grade 18/8 stainless steel with a premium powder-coated finish, it resists rust, dents, and fading. Its BPA-free sliding lid with a silicone seal offers spill-proof convenience, while the tumbler’s size fits most car cup holders, making it ideal for professionals on the move. Dishwasher safe and eco-conscious, this tumbler blends functionality with sleek modern design.

Specifications

ASIN	B07STJ9PTF
Age Range Description	Adult
Best Sellers Rank	#275 in Kitchen & Dining ( See Top 100 in Kitchen & Dining ) #6 in Tumblers & Water Glasses
Brand Name	SUNWILL
Capacity	1.3 pounds
Color	Powder Coated Black
Customer Package Type	Gift Box
Customer Reviews	4.5 4.5 out of 5 stars (28,578)
Finish Types	Powder Coated
Included Components	Lid, Tumbler
Item Dimensions W x H	3.37"W x 6.75"H
Item Type Name	tumbler
Item Weight	11.52 ounces
Manufacturer	SUNWILL
Material Features	Food Safe, Insulated, Never Rust, Recyclable
Material Type	Stainless Steel
Material Type Free	BPA Free
Model Number	TravelTumbler
Number of Items	1
Occasion	Birthday, Camping, Communion, Father's Day, Graduation
Other Special Features of the Product	Condensation Resistant, Double Wall, Sliding Lid, Spill Proof, Vacuum Insulated
Pattern	Solid
Product Care Instructions	Dishwasher Safe
Product Style	Modern
Recommended Uses For Product	Beach, Camping, Coffee, Drinking, Home, Ice Cubes, Office, Outdoor, Travel
Reusability	Reusable
Shape	Round
Size	20 Ounces
Specific Uses For Product	Cold Drinks, Hot Drinks
Subject Character	Black
Theme	Adventure, Beach, Sports
Unit Count	1 Count

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€ 45.67

Duties & taxes included

In stock

Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Croatia.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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Good experience, but the tracking updates could be better.

2 months ago

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SUNWILL Coffee Tumbler, 20 oz Insulated Travel Mug Stainless Steel

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Description

Specifications

Common Questions