Caffeine Beaker Mug, Caffeine Molecule Mug - Chemistry Mug 16 oz Borosilicate Glass Coffee Mugs with Handle and Measuring for Coffee, Latte, Tea or Hot and Cold Beverage - Tea Coffee Mug

Nice borosilicate cup/mug and as expected very thin glass and almost weightless, but delicate and not for people with big fingers.Update: I used this cup 4 times and was very careful with it and I just noticed it was leaking out the bottom. Coffee kept showing up on the countertop and after transferring to another cup I turned the is cup over and sure enough a small crack. This is absurd! I will attempt to get a refund.

I wanted a mug that would hold a full 20oz. when filled to the brim, and this "16 oz. mug does exactly that. The other key thing for me is that I wanted a mug that would be my daily "desk mug" so I could make my morning latte and have it on my beverage warmer at my desk and sip it over the course of several hours. If you have a beverage/mug warmer, you know that the key to those working well is that the mug you use needs to be flat or nearly flat on the bottom. Most mugs are not flat - they have a "ring" or "rim" around them and thus aren't flat when placed on a warmer. This mug is exactly that. I bought mine exactly FOUR YEARS AGO and have used it every single workday since! At first I was very concerned at the thin glass. But it has lasted this entire time. I hand wash it - no dishwasher. I do use it in the microwave every day to heat up the milk for my latte, and I also use a milk frother wisk to blend in my protein powder. So this thing has held up perfectly, despite how thin the material is. For my purposes this has been absolutely perfect! If I am looking for a mug to sit with on the couch or take out on the porch with me that will keep the beverage hot for a long time, this is not the mug I use for that. But at the desk and on a beverage warmer it is absolutely perfect. And the handle is also a very nice size and VERY sturdy.

Great gift for a scientist!!

I bought this as a replacement for the one my son received for a Christmas present that got cracked. It isn't quite the same but it is close enough.

It looks great, but the glass in very thin, so I’m a bit concerned about durability.

It's not so fragile as I thought it was gonna be, I even heat it up directly on my stove flame and it passed that test, very happy with my mug, keep up the good work!

It's beautiful, but the glass material is very thin.As soon as I saw it I wondered how long until it broke. The answer for me was 15 days.It might be okay for a decorative piece, but not for actual use.

I am disappointed in this mug.On the pro side it’s comfortable, appears to be made of quality glass and design, it’s also easy to clean.The biggest downfall and I think what kills this mug, not insulated so doesn’t keep drinks hot or cold very well, combined with its extreme large size exacerbates the situation. I will use this mug for decor and not fluids.