"Ventoy is an open source tool to create bootable USB drive for ISO files. With ventoy, you don't need to format the disk again and again, you just need to copy the iso file to the USB drive and boot it. You can copy many iso files at a time and ventoy will give you a boot menu to select them. Both Legacy BIOS and UEFI are supported" (ib., 2020-07-23)
Sadly sold out and no updates since years. (2020-03-03)
2.5” USB3.0 External HDD Case with virtual CD-Rom support for ISO images;
equal to IODD 2531: http://iodd.kr/wordpress/product/iodd-2531/