MT Bivy

Good Points
• It’s light. Ridiculously light.
• The four corner stake-down points prevent the bivy from wrapping around you when you roll over in your sleep.
• The zipper opens down to about the waist, making it very easy to get in and out.
• Maybe it’s the Tyvek material or just the season, but it seems to have better heat retention than regular bivies.
• I was able to sleep comfortably and warmly using just a sleeping bag liner.

Areas for Improvement
• I wish it came with a waterproof zipper—it would’ve been worth it.

When I used a Nemo Tensor All Season Wide pad, I personally felt the bivy was uncomfortably tight.
I even tried placing the pad outside the bivy, thinking that would help—but it kept shifting around, which was frustrating.
That experience made me genuinely wish it had about 200mm more in both width and height.

The large entry indeed makes getting in & out of the bivy super easy. Really like it a lot.
Plus, the bivy is spacious enough to place a closed-cell foam pad, whereas the other bivy is sometimes too tight if you do that.
I could move around freely when I was inside the bivy with the pad installed.
I did the same with an air mattress (Sea to Summit Ultralight Insulated Air Sleeping Pad, 2 in / 5 cm thickness), and it was still very spacious inside.
Recommend this bivy to anyone looking for an ultralight yet versatile solution.