Made quite a few of them. I did wash the fabric to get all the starch out so when ironing on it would bond with the fabric better. With the name remember to mirror or flip the design. Since it is going to be on a bag will probably not get washed, other wise cold water inside out.

There are two kinds that make an iron-on transfer but take care! The one for used light coloured fabrics you need to mirror the design so it comes out the right way round. However, the one for dark fabric works differently and you don't mirror the design (found that out the hard way as I didn't read the instructions!)

I used the transfers for quilts - and forgot to mirror one picture, a wedding photo of my daughter, it only shows because the groom is wearing his flower on the wrong side, fortunately no text!
I have not done it on t-shirts. Whatever you use, wash first, there usually is some size (like starch) on new materials to give them that 'new' look which might interfere with the printing.

I like the printable fabric better. Because the iron on seems to wash off faster.

I have done both. prefer the fabric sheets that I print the design on from my printer. Always wash first. If you iron on and shirt shrinks then the design does not look as nice. I have done quilts with the fabric sheets. Good luck and don't forget to post your project.
Cindy B.

can someone explain this in more detail??I am trying to get it??Do you mean you transfer a pattern of embrodery or that you are going to emb. on your shirt??please explain it ,sorry i am so thick headded carolyn