Got a saggy sofa? Fix it easy (and for under $20) with zip ties! I uses the 11 inch long length (100 pack for about $8) and it took 1.5 bags for a regular sofa. First pull off the bottom batting/fabric. Check the springs and make sure there are no broken ones. Start by zip tying the S springs around the wooden frame (at the top and bottom of each S spring.) Then start on one side and zip tie diagonally all the way across. Try it!