Uh, noob response - "I don't know?" What exactly do you mean by all-grain? Here's a link to the kit: http://brooklynbrewshop.com/1-gallon-beer-mixes/everyday-ipa-mix
As for the gravity measurement, that's a negative. I don't own a hydrometer...yet...since this was my first time around and I didn't quite research it to death like I normally do I didn't think I needed one.
It was a small packet, maybe 2" by 2", but it wasn't packed full of yeast. It was maybe 1/4 or 1/2 a teaspoon I'd guess, but I'll check the packet when I get home tonight.
I tried to post all this earlier, but apparently it didn't go through from my phone.
It is all grain, you "mash-in" your own malted barley, as opposed to using liquid extracts. That's really cool that they have the one-gallon scale kit.