The Easy2boot tools is super great, the official web site is ... :(
Anyway, Easy2boot makes it very easy to have multi-bootable USB / pen-drive for several ISO's.

REQUIRE

A big pen-drive.
Tip of space usage:

  • Easy2boot itself: 0.6 GB.
  • ISO's: x GB + y GB + ...
  • Space for defregment: > max(x, y, ...) (After putting everything, the left free space should be bigger than the biggest ISO file.)

INSTALL (UNZIP)

Download Easy2Boot_v1.88DPMS.zip.
(see official url for different types of installer)
Extract to an EMPTY folder.
(OBS: all files in the foder will be copied to pen-drive).

MAKE DRIVE

Close anti-vir soft.
Run MAKE_E2B_USB_DRIVE (run as admin).cmd.
For options, we only need to choose the right pen-drive.
Use "Enter" for other options (using default).

COPY ISO

Copy ISO files to the corresponding folder.

DEFREGMENT

Run MAKE_THIS_DRIVE_CONTIGUOUS.cmd.

TEST

(Optional)
Run QEMU_MENU_TEST (run as admin).cmd.

USAGE

Tip for win: Choco means to install updates during installation, which requires internet.