The tagless boxer briefs are the Hanes type. They are indeed tagless and are really soft and comfy. Wish I could wear them all the time but, alas, without modifications they do not offer the support needed for the packer.
As many modifications as we are forced to make in our lives as trans, I try to avoid any that I can and keep things as normal and simple as possible hence the regular briefs for packing. :-/