Product review (4 stars): Fat Trapper Bags
We use the bags with container at home for oils, grease anything that can clog the pipes.  We are on a Septic system and sending anything greasy through is a no no.  We also use the bags when camping, it helps in clean up.  They aren't very big so if you are deep frying anything it will not hold all the oils from that.  For the type of cooking I do using limited oils they work wonderfully.