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.

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☕ Elevate your daily brew game with style and performance!

ALL DAY TEMPERATURE CONTROL - Double-wall vacuum insulation locks in heat for 6+ hours and cold for up to 24 hours, so your coffee or iced drink stays perfect from morning commute to late meetings.
SLEEK POWDER COATED NAVY FINISH - Elegant, sweat-proof, and scratch-resistant coating ensures a stylish grip and zero condensation—no more embarrassing water rings on your desk.
FITS PERFECTLY IN CAR CUP HOLDERS - Travel-ready design that seamlessly integrates into your busy lifestyle, whether you’re driving to work or heading out for weekend adventures.
SPLASH PROOF BPA FREE SLIDING LID - Designed for spill-free sipping on the go, with a secure seal and straw-friendly opening to keep your workflow uninterrupted.
PREMIUM 18 8 STAINLESS STEEL DURABILITY - Crafted from food-grade, rust-proof stainless steel that’s unbreakable and built to last, making it your reliable daily companion.

The SUNWILL 20oz Travel Coffee Tumbler features double-wall vacuum insulation to keep beverages hot for over 6 hours and cold for up to 24 hours. Made from premium 18/8 304 food-grade stainless steel with a durable, powder-coated navy finish, it offers a sweat-proof, scratch-resistant exterior. The BPA-free sliding lid is splash-proof and straw-friendly, designed to fit standard car cup holders. Lightweight and unbreakable, this tumbler is perfect for professionals on the move seeking both style and functionality.

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Brand	SUNWILL
Color	Powder Coated Navy Blue
Product Dimensions	8.56 x 8.56 x 17.15 cm; 326.59 g
Capacity	20 Fluid Ounces
Material	Stainless Steel
Special Features	Break Resistant, Leak Proof
Item Weight	327 g

SUNWILL Travel Coffee Tumbler 20 oz, Insulated Mug with Lid, Stainless Steel Cup for Outdoor, Powder Coated Navy

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