cap screws on when water not frozen, pops off and will not screw on when frozen. Filled to recommended marks. What am I doing wrong?

This is due to the water getting into the threads before it freezes. Unfortunately every time you pour out the coffee, the water inside goes right into the threads. They could design the threads to be water tight, but that isnt the case currently so we just have to deal with spinning top and water gushing into our coffee.

Does this fit under a Keurig mini?

No it wouldn't fit under the brew spout of that machine to our knowledge. Most full size single cup brewers it can - the product is 6.75" tall so with clearance greater than that it's in the clear.

Size	12.5 fluid ounces
Brand	HyperChiller
Colour	Black
Material	Foam, Stainless Steel
Item Volume	12.5 Fluid Ounces
UPC	862176000310
Global Trade Identification Number	00862176000310
Item model number	HC2
ASIN	B07FJ6J24R

hyperchiller hc2 Patented Coffee/Beverage Cooler (12.5 oz, Black)

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