Bivy Sack




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A bivouac sack (also known as a bivy sack, bivi bag or just bivy) is an extremely lightweight, waterproof alternative to traditional tent systems. It is used by climbers, mountaineers, hikers, ultralight backpackers, soldiers and minimalist campers."

Bivy sacks keep you warm while making a light weight waterproof covering for your sleeping bag.

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Step 1: Materials

What you need:
~Sewing machine
~3 yards of Gortex
~3 yards of Black taffeta

Step 2: Step 1

Cut both fabrics to 2.5 yards by 40 inches.

pair up the fabrics with the white side of the gortex faceing out. Sew 1/2" away from the edges.

Step 3: Step 2

Turn the whole thing right-side-out and sew in some zippers. I used a 30" and a 8" zipper.

You could also use velcro but I hate it when things get stuck in it.

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    19 Discussions

    goretex by itself is NOT durrable which is why it is faced in most apps.   it needs a facing if used in a coat and if I wanted to use it in a situation like a Bivy I'd line it and cover it and use it for an interliner.   FWIW, kitty

    If your in the UK check these guys out. I don't think Gore will sell Gore-Tex to any Tom Dick or Harry but they seem to have a range of suitable looking fabrics.


    9 years ago on Introduction

    I don't get why you have put the black taffeta in on the bottom. Surely as a bivy bag it needs to be breathable and water tight all around you. I'm assuming taffeta isn't water proof or breathable.


    Reply 9 years ago on Step 3

    Sometimes it gets moist/hot/stickey inside a sleeping bag. My sleeping bag has a foot zipper and i made one for this also.


    10 years ago on Introduction

    very nice ive seen Bivy sacks for $99.00 USD how much did you spend


    10 years ago on Introduction

    I guess the problem is where do you get the goretex (or goretex like) sheet. I didn't sind any source in germany so far :(.

    2 replies

    10 years ago on Introduction

    For those of us in North America, there is a store in Calgary, Alberta that does mail-order, and they have all sorts of materials for building your own custom out-door items. A friend of mine built a complete custom tent with vestibule and fly with their materials. Nylon, fleece, goretex and so on.

    mattias law

    10 years ago on Introduction

    if i can get my hands on the materials, cus im in the uk, then im gonna show my friends how its meant to be done on the duke of ed. then half way through the night go into their tent when i get too cold lol for mine i would sow a layer of very durable material onto the bottom and tape the seams so that you dont rip the bottom on rocks. i would also make it mummy bag shaped and cut my sleeping mat to that size then the bivvy bag could just stay on my sleeping mat the whole time this is actually so much better than some of the ones you can buy cus you can adapt them without being afraid of cutting up your very expensive bag


    10 years ago on Introduction

    Any suggestions on where to get the supplies i.e. Gortex and Black taffeta