How many gb's on a memory stick do i need for 3000 pictures?

The amount of storage you'll need for 3,000 pictures depends on the average file size of the images. If we assume an average size of about 3 MB per photo, you'll need approximately 9,000 MB, or about 9 GB of storage. To account for variations in file sizes and ensure extra space, a 16 GB memory stick would be a safe choice.