The Dell OptiPlex 7000 Micro squeezes into 1.4 × 7.0 × 7.2 inches

At 1.4 × 7.0 × 7.2 inches and about 2.2 lbs, the 7000 Micro is genuinely compact. The trade-off is one M.2 slot and one 2.5-inch bay — no room for PCIe cards or additional internal drives.