FUNNEX™ by Chemex®

The double walled borosilicate glass actually keeps the coffee hot without burning my hand, which is perfect for camping mornings. Fits right on my mug and brews a solid 10 ounces without any mess.

Took this to the office and brewed straight into it — the 5 to 15 oz range is perfect for a solo cup that stays hot way longer than my old mug. The silicone gasket seals tight enough that I tossed it in my bag without a drop leaking.

The double-walled glass keeps my coffee hot for a surprisingly long time, and the silicone gasket makes it feel secure in my hand even when I'm moving around the kitchen. I've brewed both a quick 6-ounce cup and a full 15-ounce mug in it, and the glass cleans up without any staining.