Create bootable USB drive from InstallMacOSX.pkg

1. Erase USB drive with Disk Utility using format Mac OS Extended (Journaled) and Master Boot Record and call it MyVolume
2. Use Finder to mount/open InstallMacOSX.dmg.
3. Run following commands:

pkgutil --expand /Volumes/Install\ OS\ X/InstallMacOSX.pkg /tmp/El\ Capitan
diskutil eject Install\ OS\ X
cd /tmp/El\ Capitan
hdiutil attach InstallMacOSX.pkg/InstallESD.dmg  -noverify -nobrowse -mountpoint /Volumes/esd
sudo asr restore -source /Volumes/esd/BaseSystem.dmg -target /Volumes/MyVolume -noprompt -noverify -erase

4. To finish and fix installation issues, run these commands:

diskutil rename OS\ X\ Base\ System Install\ El\ Capitan
rm /Volumes/Install\ El\ Capitan/System/Installation/Packages
cp -rp /Volumes/esd/Packages /Volumes/Install\ El\ Capitan/System/Installation
cp -rp /Volumes/esd/BaseSystem.chunklist /Volumes/Install\ El\ Capitan/
cp -rp /Volumes/esd/BaseSystem.dmg /Volumes/Install\ El\ Capitan/
hdiutil detach /Volumes/esd
sudo bless --folder /Volumes/Install\ El\ Capitan/System/Library/CoreServices --label Install\ El\ Capitan
cp /Volumes/Install\ El\ Capitan/Install\ OS\ X\ El\ Capitan.app/Contents/Resources/InstallAssistant.icns /Volumes/Install\ El\ Capitan/.VolumeIcon.icns
cd "$HOME"
rm -r /tmp/El\ Capitan
diskutil eject Install\ El\ Capitan

5. Insert the USB drive on Machine needed reinstall.

Resources

https://apple.stackexchange.com/a/389830
https://appstorrent.ru/602-os-x-el-capitan.html