|I hardly ever use my seam rippers anymore. Insteady I have a box of disposable razorblades that I use to take RTW apart (RTW=Ready to Wear or store bought clothing), rip open seams, slice off loose threads on finished garments etc.
What I usually do with a fresh blade is that I mark one corner of the blade with a dot or star with a Sharpie, and only use this end until it starts getting dull and then I just start using the other end of the razor blade. The blade cuts through seams like butter and can slip under topstitching without damaging the fabric.
I have found that using razor blades instead of seam rippers saves more than half the time as seam ripping.
BE CAREFUL! Razorblades may cut through stitching like butter, but they also cut skin easily. Also, dispose of your blades properly by folding long pieces of packing tape over and over it.