Okay, so I wasn't totally sure what I was getting into with this purchase at first. Thought it was a regular test kit, but turns out it's way more... strategic? Let me break it down.

The belt itself is surprisingly comfortable! The stretchy material fits snug without digging in, and the width distributes weight nicely. Wore it for a few hours to test and forgot it was there.

Major props for discretion - the sample bag lays super flat (like 0.6" when full). Way better than trying to hide a bottle. The silicone funnel makes filling easy, though practice runs are definitely needed to get the angle right.

Heat retention works as advertised. Those temp strips are clutch - got accurate readings every time during my tests. Comes with 10 which is plenty for practice runs.

Only concern is long-term hygiene. While the bag feels sturdy, cleaning/drying thoroughly seems tricky. Might develop smells with repeated use?

Overall? Does exactly what it claims. If you need this type of solution, it's well-designed and effective. Just maybe not something you want to reuse forever.