It wasn't the first time someone stole my trouser clamps.  Own fault, I never take them with me...  But I am prepared! I always have some rubber bands on my bike.  One drawback is that it's quite difficult to put them on, especially because of my laaaarge feet...  To overcome this, I built this completely idiotic and redundant clamp.  It fits in every pocket and does not have any sharp edges, so it won't damage anything.  The rubber band can be wrapped around it, if it's not in use.  Idiotic? YAY - I love stuff like that 8-)