My sewing skills are fucking appalling, ha ha. I can barely patch up a pair of jeans, let alone stitch something together to hold the weight of the lock. Might have a look online and see if I can find anything suitable.
Just stick it in your belt... As long as you're not going more than ~5 miles, which i suspect you wouldn't be if not taking a bag, and not out on a serious ride, its fine. I did it every day with an average sized d lock, just loosen your belt off one notch and slip it in... ;) A little care needs to be taken when getting in/out of the saddle but no biggie...
Just stick it in your belt... As long as you're not going more than ~5 miles, which i suspect you wouldn't be if not taking a bag, and not out on a serious ride, its fine. I did it every day with an average sized d lock, just loosen your belt off one notch and slip it in... ;) A little care needs to be taken when getting in/out of the saddle but no biggie...