What to Bring:

Pack everything into your ONE backpack and make sure all your stuff is suitable for carry-on AKA liquids in containers that are < 4oz...

Backpack -- make sure to get the kind with the load-bearing waist straps.  I started out with a normal Jansport backpack and by the end of the 2nd day my shoulders and neck were killing me.  Plus on those hiking backpacks there's all kinds of convenient straps upon which you can hang your pilgrim shell or pin your clothes to dry.

Hiking Boots or Running Shoes -- Good shoes are essential.  Many people do not make it to the end of the Camino because of inappropriate footwear.  The split of people who chose boots over shoes was 50/50.  The advantages of boots is that you cannot feel the rocky ground and your feet won't bruise.  They are also usually waterproof, or at least MORE waterproof than mesh running shoes.  In addition they have ankle support which can help because the ground is very uneven, rocky, sometimes you have to jump or go through water, and the support for twisting or going down hills really helps.  A downside to boots is that  most people will get many blisters or the boot will cut into your foot and cause bleeding.  These can be more painful (in my humble opinion) than bruised soles.  I chose running shoes... The advantage to shoes is that if they do get wet, they dry easily and I did not get a single blister.  My feet hurt a lot (but so did everybody else's) and my ankles hurt going down hills but a simple ankle brace fixed that. ^_^

Walking Stick -- This is very helpful.  I would recommend buying one at one of the shops along the way.  They are sold everywhere (O Cebreiro, the Monastery in Samos, etc...) and are not expensive (8-12 euros).  This adds balance, takes some load off when you are walking up and down hills, and can help with pushing thorny shrubberies away and also if you encounter any animals, snakes, or perhaps rabid sheep... o_O

Pants/Shorts -- Most people choose the pants that have the removable legs and can be turned into shorts.  Those are handy.  I just took a normal pair of shorts and a pair of running pants.  I went in June and apart from the first day, the weather was fairly nice.

Short Sleeve and Long Sleeve shirts -- You will want to layer.  It can be quite cold in the morning and get very hot in the middle of the day.

Jacket -- like I said, you need to layer...

Wooly Hiking Socks -- imperative for cushioning and keeping you dry!

Undergarments -- no explanation required >:O

Flip Flops -- for showers and evenings

Towel -- As Douglas Adams made it known, the towel is the single most useful tool any traveler could have.  If it's good enough for the galaxy, then it should definitely suffice on Earth.

    "A towel, it says, is about the most massively useful thing an interstellar hitchhiker can have. Partly it has great practical value. You can wrap it around you for warmth as you bound across the cold moons of Jaglan Beta; you can lie on it on the brilliant marble-sanded beaches of Santraginus V, inhaling the heady sea vapors; you can sleep under it beneath the stars which shine so redly on the desert world of Kakrafoon; use it to sail a miniraft down the slow heavy River Moth; wet it for use in hand-to-hand-combat; wrap it round your head to ward off noxious fumes or avoid the gaze of the Ravenous Bugblatter Beast of Traal (such a mind-boggingly stupid animal, it assumes that if you can't see it, it can't see you); you can wave your towel in emergencies as a distress signal, and of course dry yourself off with it if it still seems to be clean enough."  

                  --Adams, A Hitchhiker's Guide to the Galaxy

Poncho -- because undoubtedly it WILL rain on you and on all your stuff!  :O

Toiletries -- travel toothbrush/toothpaste, travel size: shower gel, shampoo, conditioner, lotion, sunscreen, bug spray, baby wipes, deodorant, hair gel and makeup?  (personally I don't feel that just because you're on the Camino you have to look shabby :-P) disposable razors, tampons (ladies only o_O) HAHA!

Euros -- most little cafes and albergues do not accept credit card.  There are also lots of towns along the way with ATMs so do not fret!

Camera -- uhm yea...

International plug converter and your Chargers n00b!


Sunglasses and a HAT

Flashlight w/batteries

Leatherman or Swiss Army knife will do...