Review on Stealth Cam Micro USB OTG Memory Card Reader: Enhanced Android Device Compatibility, Black, STC-SDCRAND by Stetson Olsen

Fits in a wallet-sized case with 4 memory cards. It's much easier to deal with than a large reader. I either save the files to my phone or just take out the card to view later. The only thing you need to save the files on the phone is to scroll through the full size images if you can't just see the small images and have to click them to open and then come back to see more