if you want an easy way to make some homebrew stuff sacks hunt for some BDU pants with shredded knees, butt or crotches. they should be easy to find in a surplus store or a thrift shop.
cut the lower part of the leg off below the reinforcement on the knee and stitch it closed at whatever length you want.
ok, it's NOT a compression sack, but you can usually find the shredded BDUs for $1 or possibly less and you get two partially made sacks. these are handy for all kinds of general utility stuff.