RAVPower's FileHub is a battery-powered 802.11ac router and wireless SD card reader: $45 (Reg. $60)
RAVPower FileHub (2019 Version)
Why everyone needs a Ravpower Filehub in their computer bag
RAVPower FileHub Travel Wifi Router, SD Card Backup, & File Streaming Test & Review
The RAVPower FileHub: A Travelling Photographer's Best Friend
RAVPOWER All-IN-1 FILEHUB REVIEW - MacSources
Portable Wireless Router - The basic function of this device is used as a portable wireless wifi router; It can turn a wired network to be wifi
NewQ Filehub AC750 Travel Router: Portable Hard Drive SD Card Reader & Mini WiFi Range Extender for Travel | Wireless Access External Harddrive & USB
RAVPower FileHub, Travel Router AC750 - Other Gear & Services - Firecore
Ravpower Filehub Review: Backup Your Footage WITHOUT a Laptop!