This came up in the thread about "what you consider necessary on a ride" so I hesitate to mention it, but here goes...is there any argument against using a hydration pack?

I'm considering it because of poop. Horse poop, goose poop -- usually I can avoid it, but yesterday I had to choose between riding over poop and colliding with a pedicab in Central Park, and I picked the poop.

Having the weight of the liquid on my body instead of on the bike would be easier when carrying the bike up stairs, and I object to the expense and waste of bottled water.

Again, not looking for an argument; just wondering if I've overlooked something that's apparent to everyone else. Also, are hydration packs something people will make fun of on bike club group rides? Not that I care very much, but I like to be prepared.

Pam