Apologies in advance if this has been previously posted, it's not brand new but it's fresh to me. I stumbled across Ventoy earlier today. Really, stumbled, I wasn't looking for a super-easy multiboot USB utility. But I found one & here we are. Open source, really well documented, extensible too.
I have several bootable USB flash drives that I refer to regularly - each & every one is a waste of space. Winstall on 16GB flash - it's only using 5GB. Also the hassle of identifying which is which without resorting to a Dymo label maker. Most of my flash drives are 64GB these days - even more waste of space.
Ventoy is my answer. I don't need individual drives any more & I don't need to spend hours creating multiboot menus either. Use Ventoy to create a bootable drive then dump your disk image files on there. That's it, you're done. Reboot.
The directions were specific but surely couldn't be that easy? Download Ventoy from GitHub, all 14MB of it. Extract & run Ventoy.exe from the folder, installation not required. Insert your flash drive, about 2 minutes later it's done.
Now, grab all the various OS you have in .iso/.wim/.img/.vhd(x) & .EFI format (Linux,Windows, BSD, file format doesn't matter) & dump them straight onto that flash drive. Ok, reboot. Ventoy generates a selection menu on the fly, click your preferred OS file & enjoy life.
Get Ventoy here: https://GitHub.com/ventoy/Ventoy/releases