USB Memory Stick for RPi

Hi there me hearties,
I have built a time lapse camera with my Pi Zero, Zero Lipo, Pi NoIR Camera, some IR LEDs etc.
The battery is a 2500 mAh and so should last a day or so and the system is set up to take one frame every five minutes. I’m thinking of changing the power source to a mobile phone battery pack which will last for ages but obviously the SD card is going to get full before the battery runs out and so was thinking of using a USB memory stick. Any ideas on how to use it and get the photos to save to that?

well make sure the format of the memory stick is FAT and then just plug it in.
Then change the path of the saving in your code to where the memory stick is located.