My other city pack is a Camelbak H.A.W.G. -- good choice. In summer, if I'm going to be ducking into a cafe or other air conditioned places, it is nice to have a light jacket so have to have some space (I carry a super light Marmot water resistant windbreaker with hood).

You may not be as vulnerable to afternoon thunderstorms as we are - here the weather can turn very quickly on a sultry summer day.

I also carry a little AM-FM radio in the city.

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