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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Description

☕ Stay hot, stay cool, stay ahead with SUNWILL.

FITS YOUR LIFESTYLE - Compact 20oz size fits most car cup holders—ideal for office desks, travel, or outdoor escapades without missing a beat.
BUILT TO LAST SAFE - Crafted from premium 18/8 304 stainless steel—rustproof, BPA-free, and unbreakable for daily hustle durability.
SPILL PROOF ON THE GO - Silicone gasket sliding lid with straw-friendly design keeps spills at bay, perfect for your commute or gym sessions.
SLEEK SCRATCH RESISTANT - Powder coated navy finish resists fading and scratches, giving you a stylish grip that stands out in any meeting or adventure.
ULTIMATE TEMPERATURE CONTROL - Double-wall vacuum insulation locks in heat or chill for hours, so your coffee or cold brew stays perfect all day.

The SUNWILL 20oz Tumbler combines advanced double-wall vacuum insulation with premium 18/8 stainless steel to keep beverages hot for over 6 hours and cold for up to 24 hours. Featuring a BPA-free, spill-proof sliding lid and a durable powder-coated navy finish, this sweat-proof tumbler is designed for professionals on the move who demand style, functionality, and reliability in their daily hydration.

Specifications

Brand	SUNWILL
Colour	Powder Coated Navy Blue
Special Feature	Microwave Safe
Style	Modern
Theme	Sports
Recommended Uses For Product	Home, Office, Travel
Included Components	Lid, Tumbler
Specific Uses For Product	Cold Drinks, Hot Drinks
Shape	Round
Pattern	Solid
Product Care Instructions	Hand Wash Only
Age Range (Description)	Adult
Material Feature	Insulated
Cartoon Character	Navy Blue
Reusability	Reusable
Net Quantity	1.0 count
Item Weight	327 g
Product Dimensions	8.6W x 17.1H Centimeters
Material Type Free	BPA Free
Number of Items	1
Team Name	mit
League	ncaa
Customer Package Type	Gift Box
Pattern	Solid
Finish Type	Powder Coated
Manufacturer	SUNWILL
UPC	670924518426
Size	20 Ounces
Country of Origin	USA
ASIN	B07MV6Z896

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