Since it's stainless steel, can I use this with a ceramic mug warmer or would the vacuum insulation design make that pointless?

Completely pointless and unnecessary.

Got it today. Liquid seeped underneath and burnt my lips and chin. Is this a product fault or a one off?

Fill up just under the threads inside the cup. Anything more will get trapped between lid and inside threads and spill out at you

Son originales....y ha sido el mejor dinero gastado en un vaso térmico. Extremadamente aislante.!!!

Returned it...just to big for my vehicle holder.

Deliver to Seychelles

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Brand	YETI
Color	White
Special Feature	heat_reveal_technology, magnetic, rotating, leak_proof, Leak Proof Insulated
Style	Modern
Theme	Travel
Recommended Uses For Product	Travel
Included Components	Lid
Specific Uses For Product	Hot Drinks
Shape	Round
Pattern	Solid
Product Care Instructions	Machine Wash, Hand Wash Only
Age Range (Description)	Adult
Material Feature	Insulated
Reusability	Reusable
Unit Count	1.0 Count
Product Dimensions	4.05"W x 8.34"H
Number of Items	1
Item Package Dimensions L x W x H	8.86 x 5.75 x 4.41 inches
Package Weight	0.69 Kilograms
Item Dimensions LxWxH	5.12 x 5.12 x 8.31 inches
Brand Name	YETI
Manufacturer	YETI
Part Number	888830214565
Size	1 Count (Pack of 1)