So far the canopy is great. We are novices at all this; we could have used more specific instructions although we did get it together. In the weight bags (which are very nice) we put bricks which I think will suffice. Also we had made weights using 
 2in. PVC tubes, filled with cement and a large eyeyscrew (inserted before cement dried) - plan is to attach tubes to the top corners of canopy and strap to legs at ground level. this along with the bags will secure well.