Anti-Yarnblob Device

Sometimes, you get a slippery yarn that just won't stay on the spool, and winding it into a cake is right out. In those instances, I use a highly specialized anti-yarnblob device:

This high-tech gem is a resealable sandwich bag with one of the lower corners cut off. The yarn is fed through the hole, and the friction and small size of the bag keeps the yarn reasonably contained but able to spin enough to get the yarn off the core.