WinUSB

WinUSB is a lightweight program that lets you create a USB device loaded with various versions of Windows. All you need to create this 'bootable' USB is to have the ISOs or the DVDs of the operating systems you want to use. For example, if you want to create a USB device for installing Windows 7, Windows 8, and Windows 10, you need to have the ISOs of the three versions.

From WinUSB's interface, you can watch an entire tutorial about how to use the program. You can even find a direct link to Microsoft's website where you can download the ISO for Windows 10 (as long as you have a license, of course).

WinUSB is a program that lets you create an emergency USB device with various versions of Windows on it. This way, whenever you need to format your computer, all you have to do is insert the USB and proceed with the installation.