Small Bag for Commute

So, I'm after a bag. Quite a small one. But I don't know if such a thing exists...
I'm starting back on my full commute next week (I bike-train-bike in the darker months) of about 20 miles each way. I've got a locker at work and there are some days when I have to drive in, so getting most of my stuff to work is pretty easy. Ultimately the only things I need to take with me on a daily basis are my food, mobile, and occasionally a few small bits of paperwork or electronic gadgets.
With that in mind, I don't really want to bother with fitting an entire pannier; neither do I want a rucksack heating my back up and making me sweatier. Does anybody know of anything smaller that would do the job? I suppose a bar bag would do, but I'm not really feeling the love for that idea. A messenger-style bag would maybe work, but would probably still be too big. Does anybody have any ideas for stuff that's a bit too big for jersey pockets, but not big enough to justify a full-sized bag?
Thanks
I'm starting back on my full commute next week (I bike-train-bike in the darker months) of about 20 miles each way. I've got a locker at work and there are some days when I have to drive in, so getting most of my stuff to work is pretty easy. Ultimately the only things I need to take with me on a daily basis are my food, mobile, and occasionally a few small bits of paperwork or electronic gadgets.
With that in mind, I don't really want to bother with fitting an entire pannier; neither do I want a rucksack heating my back up and making me sweatier. Does anybody know of anything smaller that would do the job? I suppose a bar bag would do, but I'm not really feeling the love for that idea. A messenger-style bag would maybe work, but would probably still be too big. Does anybody have any ideas for stuff that's a bit too big for jersey pockets, but not big enough to justify a full-sized bag?
Thanks
Twitter: @FunkyMrMagic
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http://www.carradice.co.uk/index.php?pa ... duct_id=43
Waterproof and roomy enough for all the commuting essentials.
If you don't have a brooks saddle you can get quick release fittings that attach to the seatpost which is handy if you're leaving the bike outside.
only downside is ofc you need a rack to mount it on (although tbh, mine weighs almost nothing).
Hope this helps.
http://www.gooutdoors.co.uk/race-pro-4- ... ck-p182450
http://www.amazon.co.uk/Altura-Arran-Ex ... RE5N4LFN17