Last year, for Halloween, I got one of those posable, fuzzy, giant spiders. I love spiders. And I saw an egg sac in one of those Halloween stores, with an outrageous price tag. If it had been reasonable, I wouldn't have had the notion to make my own, but I'm cheap, so... I bought a bag of webs and hit the drawing board. Here's the cheap, easy way that I came up with, just because I love you!
And, yes, I know Halloween was a while ago...
Start with a wad of newspaper, very slightly smaller than the size you want your finished sac to be.
Put enough plastic bags around the newspaper so that it looks fairly smooth.
> Don't worry about getting the plastic bags really tight, or the shape perfect: it'll look more realistic.
> I recommend unwadding and rewadding the newspaper several times until it is fairly worn.
Now, take the whole thing and put it in a white plastic bag without any logos.
Knot the bag fairly tightly, but without distorting it.
(The tape is there because some of the bags I used for the inside were torn down the sides, so I taped them down.)
Tie a length of white yarn under knot and make sure it is secure!
Now, twist the tail of the bag around the yarn, as far up as you can and tape it down.
> I used a little strip of newspaper at the base, to make it thicker. Also, try not to use too much tape...
Take your artificial web stuff (=D) and tape the end of it down. Then cover your sack. I don't know how to explain how I did it; I opened it up a little and wrapped it a couple of times around the bag... I'm sure you'll figure it out.
> I kind of scrunched the webbing down as I went.
The working end of your webbing should end up towards the top of the sac.
Now is the time to start stretching it. Wrap it as tightly as you can around the top and cut off the excess. I used a >little< bit of glue along the length, just to be sure.
Now, take the whole thing and spray it lightly. When it's dry, hang it outside, preferably out of the rain. We had very light showers and mine held up, but I still think it would be better to stay on the safe side...