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The Survival Zone Lite weighs just 200 grams and beats the previous lightweight champion, its predecessor the regular Rab Survival Zone (320g).
It packs down to the size of a cotton sleeping bag liner, not much larger than a tennis ball.
The difference? The original Survival Zone bivy has a hydrostatic head of 10,000mm (i.e. properly waterproof) rather than 1,000mm for the Lite and feels a bit tougher. The Survival Zone weighs 320g and Survival Zone Lite weighs 200g.
I have a Rab Ascent, eVent top, as @skinny said - quite big and bulky but loads of room inside + midge net... great all year round.
Also have a Rab Survival Zone, the older version which is <300g, only use this for events and if the weather isn't supposed to be ultra shit...
Think Mike is semi-sponsored by Rab so I'd guess he uses the newer Survival Zone or Survival Zone Lite