I’m quite used to doing presentation slides in Inkscape. However there’s no proper multi page support in Inkscape. After a quick search I found a person on Stackoverflow that had the same issue. So I found out that you can use GhostScript to merge several PDF’s into one. You can also use it in order to decrease the filesize of a PDF.
gs -sDEVICE=pdfwrite -dCompabilityLevel=1.4 -dPDFSETTINGS=/default -dDetectDuplicateImages -dNOPAUSE -dQUIET -dBATCH -dCompressFonts=true -r150 -sOutputFile=output.pdf page1.pdf page2.pdf page3.pdf