Anyone else use a key case when cycling as a safe way of having your keys on you rather than in a saddle bag or top tube bag? Have tried two, one from John Lewis which after a while started to lose a key; the key holder sections having insufficient tension to retain a key - a bit of obvious weakness. Also one of the retaining loops the key holder sections fit onto fell out. Now tried one off ebay that has far stronger key holders with no problem retaining the keys but the loop they fit to are weaker and two have already parted company. So any recommendations of one that stays together would be appreciated preferably with a detachable key holder