topeak large http://www.topeak.com/products/bags/AeroWedgePack_large_velcro its holds EVERYTHING...extra tube, hand pump, large multi tool, tire levers, patch kits, first aid kit, my phone, my keys and my MTB card/ID/medical crap. Sometimes i use a small bento bag i use to put a snack/gels in.
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MTB in florida isnt really like normal mountain biking...for us its more trail riding than anything. Its all really tight turns/switch backs...a lot of coral rock (which caused my flat), really sugary sand in some places.
However, its challenging...our parks are not HUGE like national parks, so they have to make do with very little space. With that space they came up with some pretty sick stuff.
Anytime you guys are ready...ill go out with you and show you around, even if you dont think you can do better than brent =)
Its all good...just stay on the trail and you wont get lost.