Getting shirty!

[AndyRM]

Get a job where you don't need to wear a shirt!

I do (as I work for a bank), but I'm part of the cool and hip design studio so nobody questions my un-ironed shirts.

 

[Ganymede]

Top tip: rolling is best but even better if you lay a sheet of tissue paper, or a thin cloth such as a clean tea-towel, or one of those thin travel-towels, over the shirt before rolling. Roll both up together. Paper is best as it weighs nothing and takes up barely any extra space. Obv as a laydee I save the tissue paper that I sometimes get when buying clothes. In fact, a plastic bag would probably do the trick too.

 

[PlymSlimCyclist]

I fold it so it's in half (collar in half, buttons pointing out), pull sleeves together the cuffs sit at the base of the shirt. "Fold" down, again, then across, it makes it small, but I also make sure my lunchbox is underneath it, tie on top with my iPhone case, shirt's don't badly crease, and never had a complaint or bad creases doing this.

When I say "fold" I don't put any pressure on it, I make sure it's all neat before putting it in the bag.
When I was a little bigger, this took me a few goes to get it right, but now I'm a smaller size, this method works a treat. (I'm using a rucksack, not panniers currently).

 

[AndyCh]

Washing, ironing, folding, rolling, and still getting creased shirts? Don't bother with all that.

I take my dirty shirts to the dry cleaners near work, washed and beautifully ironed for a poond each. It is the best quid you can spend. No pile of washing, no endless ironing of difficult shirts, no carrying dirty laundry or squashing clean gear in your rucksack, and no army trained packing required!