I have a Twopeak wedge bag and with careful packing still have room for two mini pork pies if the expansion zip is undone.
The saddle bag is the one I use and does what it says on the tin... I have one of the multi tools you link to, it's okay, but the tyre levers are flimsy and one of mine snapped when trying to get a Gatorskin off.
Its my birthday this week and ive asked my "daughter" to buy these for me! what do you think?
http://www.ebay.co.uk/itm/291261828112?_trksid=p2060778.m1438.l2649&ssPageName=STRK:MEBIDXT
This is of course a great option if you're running two cages, but you could use any bottle.Have you seen these?
My mate has one and it looks much neater on the bike. He uses it on 40 mile or less rides
PRO 750ml Storage Bottle https://www.amazon.co.uk/dp/B0027JVMJU/ref=cm_sw_r_awd_9sRoub13J9QKT