Instructables
Picture of Bivy Sack
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.

Oh and this is in the stay warm contest so vote for me!
 
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Step 1: Materials

What you need:
~Sewing machine
~3 yards of Gortex
~3 yards of Black taffeta
~Thread
~Zipper/velcro
tim11 year ago
So how is this waterproof?
branson graf tim15 months ago

gortex is waterproof

Excellent design. I didn't know you could buy Goretex straight. Is it durable?
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.

http://www.pennineoutdoor.co.uk/catalogue.asp?cID=1
http://www.profabrics.co.uk/snap_product_search.php

balhamas5 years ago
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.
annienm5 years ago
I don't get what the lower eight inch zipper is for?
QuiksilverRox (author)  annienm5 years ago
Sometimes it gets moist/hot/stickey inside a sleeping bag. My sleeping bag has a foot zipper and i made one for this also.
tysonb5 years ago
I just did a search on eBay and found it for about $7 per yard @ 55" wide.

The link below should work - Gore tex fabric - was the search term.

http://shop.ebay.com/items/?_nkw=gore+tex+fabric&_sacat=0&_fromfsb=&_trksid=m270.l1313&_odkw=gore+tex+fabric&_osacat=0
abadfart5 years ago
very nice ive seen Bivy sacks for $99.00 USD how much did you spend
tecneeq5 years ago
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 :(.
karg tecneeq5 years ago
tecneeq tecneeq5 years ago
Sind? I mean find of course ;).
BJMN5 years ago
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. www.campers-village.com
mattias law5 years ago
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
Caleb7775 years ago
Any suggestions on where to get the supplies i.e. Gortex and Black taffeta
man those things are really expensive if you try to buy one. I seen one priced over 600 bucks
You can buy them here

http://www.alpkit.com/shop/cart.php?target=category&category_id=253&pageID=1

for £30, $44 (I don't know how recent there exchange rate conversion is)
QuiksilverRox (author)  thematthatter5 years ago
this works just as well but cost around 50