You shouldn't have to PDF a review with pictures to make it small enough to mail. If you go find the Sabre 60/100 review that I wrote, that has a fair few pictures and came in at just a bit over 1Mb as a Word file, inc the pictures. When I sent it in, I also sent Tony the image files since I believed that they needed to be stored separately and linked in.
What you need to do is to reduce the image size to between 50kb and 120kb, aiming for the lower end of that range. All those rucksack images were less than 60kb.
If you paste a large, straight from camera, image into Word, then resize the image in Word to fit on the page, all the information required for the large image is stored as part of the Word document, so bloating the file. Use photo software to "resample", save as a new .JPG file with about 10% compression, then paste into the review