Do you have a sewing machine? Whenever my pants get rips in them I use the sewing machine to make the repair. What I do is, take the area that needs repairing, smooth it out as much as possible while aligning the edges of the area to be repaired the best I can. Next sew back and forth across the area connecting the two torn areas together. So if you have a vertical rip in the pants, you should be sewing horizontally back and forth across it. To reverse across the rip, just put the machine in reverse and guide the pants back under the needle. Try to go slow because you will get better results. Also, try to extend anywhere between 1/2 inch - 1 inch past the area being patched. The stitch I use is the one that is the smallest zig zag stitch. I have been using this method for a while now and some repairs in my jeans are still going strong even after several years of continued wearing and washing. It is not a pretty repair, but definitely works well.