You can get a 128 Gb thumb drive from Amazon for like $30. That should be big enough for an email file.
The 2010 edition (the last print-edition that Encyclopedia Britannica will ever publish) consists of 32 volumes and weighs 129 pounds. (Source) At 50 million words or about 300 million characters, it requires roughly gigabyte to store the text electronically (leaving out images and diagrams).