Hi as I sat here reading your post I was printing my all ears newsletter. Lo and behold the tip of the week talks about fanny packs. Lori uses the Mini Sidekick by eagle creek her list says it can hold: theme park pass, roomkey, photo id and cc, DC card, mini flashlight, pen, sm. notpad for trip notes, PDA, cash, pain reliever, imodium ad, band aid travel pack, shout wipes, wet ones, hand sanitizer, sunblock,lipbalm, lg tooth comb, aps camera, rain poncho,pins that aren't on lanyard,park map, autograph book, saftey pins, moleskin. All first aid items are travel size, and has room to put pin lanyard and sunglasses when needs to.
Hope this helps.
My smaller fanny pack is columbia or northern something and it has 2 holders for water bottles. that is the one I plan on carrying the other huge one I use as a diaper bag and it buckles to the bottem of the strollers It was put out by LL Bean but they don't have it any more. I used it snowmobiling to carry 1st aid and what not but it's so big I swear I don't know how I stayed on the sled. Oh well it works great now and I don't have to carry the huge thing. Good luck If you want the exact name of the other pm or email me and I'll go out to the camper and get it (yes it's already packed, I'm miles ahead and I'll still forget something)