I went through this a few months ago

11oz for xpres -horrendous print quality, very patchy.
5013 xpres excellent (though expensive)
Raja same quality as 5013 same price, complete ball ache to deal with
Transfer Press (actually a Raja mug), good to deal with, same price as xpres 5013

Now the ...

The boxes are for banners so i use colompac 108 x 108 x either 610 or 705mm.
Yes the text will only be the website address and basic logo.

There are essentially 2 views on how to work Etsy.

1/ As many products as fast as possible and advertise everything with loads of money.
2/ Don't do the above.

A link to a chap who is the second option.

https://www.youtube.com/@etsyconsultant

I have linked to that as there are gazillions of ...