I'm a National Mountain Bike Patroller, so I tend to carry a lot.
The pack, a Wingnut Adventure. Tons of room, which can be a problem. Also visible is the handy sternum strap whistle buckle. On the other side is a strap pouch that holds my iPhone, $, lip balm, business cards and a tethered Space Pen.
I use an older style Camelbak 100 oz bladder. I like the smaller screw top (I have both small and large tops) because I freeze my bladder and the larger tops have a large groove which gets stuck in the ice. I always use an insulated hose.
In the pack is a waterproof windbreaker with removable arms. Also Lezyne pump, Chamois Butter sample, sunscreen, compass, lighter, tube, TP,vet wrap, cravat, First Aid Kit, zip ties, leg warmers, space blanket, and arm warmers.
In the side wings and strap pouch are a tool kit with patches and small parts, tire levers, reading glasses, spare derailleur hanger, small screw driver, dog leashes, multi tool small vise grips, small adjustable wrench, Chapstick, folding saw, Leatherman multi tool, $5, business cards, lip balm, Olbas inhaler, more small parts, parachute cord, and multi purpose snot rag. Also I forgot the monocular/magnifier.
The First Aid kit has all sorts of stuff. Every time I open it I find new items, or items that I totally forgot I had.
On the tootsies I have Pearl Izumi X-Alps. I love these shoes, and will replace them with another pair.
On the melon goes a Rudy Project helmet, it's never been crashed, but it's getting old, so time to spend some bucks on a new one.
On the bike I have a Revelate frame bag. It carries the spare tube, collapsible water bowl, dog water and dog treats. It's also a great source of shade for the little black sun magnet. It also works great to thaw overly frozen bladders on those days when I run out of liquid water.