Favourite bits of kit: Equinox Mummy Bivi (188g)

I was alerted to the benefits of carrying a bivvy bag even when not intending to actually bivvy when I found myself sleeping a bit cold at night on my second TGO Challenge a couple of years ago, and a friend sent his spare Rab Survival Zone bivvy bag up to Kingussie for me to collect en route to the Lairig Ghru. It didn’t weigh much, and after I’d slipped my sleeping bag into it at night I was toasty warm for the rest of the trip. As a side benefit I found that I was also protected against the risk of accidental Titan mug and Kettley Thing slippages in the tent…

A year or so ago, though, I decided to try to find something even smaller and lighter, and after a bit of searching I came across the Equinox Mummy Bivi on the Winwood Outdoor site. I ordered one, and now I take it every time I go out. It weighs only 188g, and it packs up to almost nothing. In the morning I just pile it back into its little stuff sack (no folding necessary), and squeeze it into any convenient space at the bottom of my pack.

Winwood say:

This innovative bivi is made from super tenacious 1.1oz ripstop. The silicone impregnated bottom and water repellant breathable top provide amazingly lightweight protection for your sleeping bag.
Measures 72-1/2″ to shoulder and 83″l x 33″w overall.

* Webbing loops for stakes
* Mid-length 27″ zipper (#4.5 YKK) for easy access
* Packaged in a reusable no-see-um mesh storage bag
* New Mummy style with micro cord drawstring and mini cord lock
* Weighs only 6.6oz
* Manufactured by Equinox in the USA

I’ve only used it outdoors in the conventional bivvy bag sense once, in Corsica, and it was great. It was a dry night, though, albeit windy, and so I have no idea yet how it would perform in UK conditions.

However, the main reason I carry it is to lend a bit of extra warmth in the tent on unexpectedly cold nights. Even though I tend to sleep quite cold, it converts my very small and light PHD Minimus sleeping bag (520g) into something that will keep me warm in all but the coldest conditions. And having it there means that if I do have a bit of a brainstorm, and decide to sleep outside the tent, I can do so secure in the knowledge that I have some protection for my sleeping bag.

If I can overcome my insect/arachnid aversion I’ll give it a try outside in the Lakes before summer/autumn is out. Watch this space… *g*


9 Responses to Favourite bits of kit: Equinox Mummy Bivi (188g)

  1. alan.sloman says:

    Reading Dawn today, the slugs and midgies do it for me.

    A bivvy bag inside a double sin tent -now that starts to make sense…

    Fancy the Ridgeway this weekend Shirl?

  2. peewiglet says:

    Ooh, wow! Yes, I do! 🙂

    *checks the map*

    But I don’t think I’d be able to get there in time 😦 I have to meet with people from work tomorrow, and it’s very likely that I won’t get home until late.


    Who stuck the Ridgeway all the way down there, then? Very bad planning, it seems to me! Thank you v. much for asking, though.


  3. blogpackinglight says:

    I’ve got one but not used it yet. I’ve been tempted to use my Western Moutaineering HighLite bag in conjuction with the Equinox and a silk liner as a modular system where you can adjust your temperature by adding or subtracting layers. It would weigh marginally more than my Alpkit Pipedream 400, but would it be as warm?

  4. blogpackinglight says:

    That should be “Mountaineering” not “Moutaineering”!

  5. peewiglet says:

    I think that sort of layering system makes a lot of sense for sleeping kit, just as it does for clothing, and particularly when it’s possible to press one or more of the items into more than one use.

  6. Martin Rye says:

    To have a bit more warmth Shirl, get a down vest like the new PHD one – 150g lots warmth sitting around and in the sleeping bag. Much better than a bivy, looks nicer to.


  7. peewiglet says:

    Thanks Martin. I’ve got a down smock (the Liv Down smock that Bob sells–I bought the first one, I think), and also a PHD Minimus down vest, and when it’s cold I do wear one of those in bed.

    I like the bivvy, though, for the reasons mentioned above. For the weight and size and versatility of it, I think it’s better value than taking a heavier bag, or additional clothing.

  8. Imperial Dave says:

    I have owned one of these bivvy bags for a couple of years now and it never leaves my sack…..
    excellent bit of kit and a bit of insurance should the tent fail……..

  9. peewiglet says:

    Hello Dave,

    I’m glad to find another user 🙂

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