I need to carrry A4 paper, so my bag have to be large enough for that. So it's bigger than need be. But it's sometimes usefull.
Else there is umbrella (most of times), nitendo DS, cybook, hearphones.
And a smaller bag with cellphone, paper tisues, keys, cards, money. So i don't loose time looking for train card, cradit card. And can take that bag for luch meal without having to carry everyting.
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