I only needed room for one SSD drive so more than enough room for 4 x 2.5" drives. I just needed to fill the 5.25 inch space that used to house the internal optical drive. I have since replaced it with an external thin drive for use with other systems. Because it's aluminum, it fits my aluminum suitcase perfectly. My PSU is now the heaviest piece; I look forward to aluminum power supplies.
10 TB External HDD Western Digital WD Elements Desktop, USB 3.0, black
17 Review
Hard Shell Case with 5 Attachment Slots for Hyperice Hypervolt Bluetooth, Portable Storage Box for Hypervolt Portable Massage Gun - Case Only
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π¦ FIDECO 3.5/2.5-Inch Hard Drive Enclosure Case with Fan, USB 3.0 to SATA Adapter for HDD & SSD External Hard Drive - Supports 16TB with UASP
12 Review
External sound card Focusrite Scarlett 2i2 3rd Gen
16 Review