FTC Disclosure: Some of the links on this page may result in compensation to the site owner when you click on them and make a purchase.
If you have a Keurig coffee maker then you probably know by now that not not all of the normal insulated mugs and tumblers fit under neath them. Not only are the openings small but even if normal travel mugs fit they wouldn't be very full because most of the Keurig coffee makers don't make large amounts of coffee; they don't make enough coffee to fill normal 14-16 oz mugs.
To trick to finding a good travel mug for a Keurig coffee machine is to find a short travel mug or a small travel mug that isn't designed to hold large quantities of liquids.
I've been a big fan of single serve coffee makers since I first used my dad's machine a few years back. I like drinking my coffee slowly so a cup at a time is nice to have good coffee without having to brew a huge pot every time. Since these kind of coffee makers are so common now there is a growing supply of small insulated mugs out there that are perfect for fitting underneath Keurig coffee systems.
Here Are The Keurig Sized Travel Coffee Mugs I LikeBelow I've listed some of my favorite top rated short travel mugs to fit below just about any Keurig machine. First on the list is the new(ish) Keurig Contigo travel mug which is the official Keurig travel mug with Keurig branding and all. It's a very good mug but it's not the only viable option.
16 Ounce Contigo Travel Mug
This is the official Keurig travel mug. It is basically a Contigo Autoseal travel mug but only smaller. It is short enough to fit under all Keurig machines with a water reservoir. The mug is definitely a high end travel coffee mug and it will keep your coffee hot for a long time will almost eliminating the chance of spills or leaks but for Keurig single serve machines it's still not my favorite. For some of my favorite insulated mugs see below.
Keepcup is actually my favorite mug right now for all single-serve coffee machines. They hold anywhere from 8-14 ounces depending on the mug you choose, which is a perfect size for pod coffee makers like Keurig and they're not really designed to keep your coffee hot all day long which keeps their price down. For 10 ounces of coffee you really don't need all day long thermal retention anyway.
Of course another option for Keurig machines is to just use a normal ceramic style mug with lid or cover. Assuming you are sitting at a desk this would also be perfect. You can see a post on those here - Coffee Mugs With Lids: An Awesome ideas For Anyone Who Sits At A Desk All Day.