I don't think I ever forgo my lock when I lived in Manhattan, but if I did it wasn't enough of an issue to remember. Now that I live in the burbs, I often don't carry a lock, so it's easy to forget if I don't consider all my planned stops. But even than it's not too big a deal and I can figure a workaround.
However, I've ridden all the way to the warehouse in the rain only to find I forgot the key. No fun at all, so I now keep spare warehouse key attached to a waterbottle boss. IME forgetting a key is far more inconvenient than forgetting a lock.
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Last edited by FBinNY; 09-26-14 at 07:50 PM.