This little bag with a long string is made from my stash. If you buy 50 grams of each type of yarn, there is enough for two bags (at least).
Instead of fabric I have knitted the lining in order to retain the shape of the bag (and to avoid leaving my sofa to reach my sewing machine…) :-)
For the lining use sock yarn and 4 double pointed needles 2,5mm (US 1½) and knit with a fifth dpn.