I had a small USB flash drive but it kept popping out when I put my laptop in my bag and took it out. It resides permanently in my laptop and when combined with a microSD card has functionally increased disk space by 50%. It's a little difficult to remove my camera's SD card when I've had to swap it out a few times to take photos, but it makes me realize it'll never slip out later.
TP-LINK UH700 USB Hub, 7.1cm Ports, Black
12 Review
Neewer Black Memory Card Storage Holder - Waterproof, Anti-Shock with 14 Slots for Micro SD, TF, CF, SD and XD Cards
12 Review
💾 ZIYUETEK Aluminum USB 3.0 Micro SD Card Reader for PC - Portable Memory Card Adapter with TF Card Reader
12 Review
IDENTIV USB Smartfold Type C SCR3500C
11 Review