I do not know if this is the best practice, but I do it like this.

(setq org-latex-default-packages-alist
      '(("AUTO" "inputenc" t)
    ("" "lmodern" nil)
    ("T1" "fontenc" t)
    ("" "fixltx2e" nil)
;    ("" "charter" nil) ;; a decent font
;    ("expert" "mathdesign" nil)
    ("" "graphicx" t)
    ("" "longtable" nil)
    ("" "float" nil)
    ("" "wrapfig" nil)
    ("" "rotating" nil)
    ("normalem" "ulem" t)
    ("" "amsmath" t)
    ("" "textcomp" t)
    ("" "marvosym" t)
    ("" "wasysym" t)
    ("" "amssymb" t)
    ("" "amsmath" t)
    ("version=3" "mhchem" t)
    ("numbers,super,sort&compress" "natbib" t)
    ("" "natmove" nil)
    ("" "url" t)
    ("" "minted" nil)
    ("" "underscore" t)
    ("linktocpage,pdfstartview=FitH,colorlinks,
linkcolor=blue,anchorcolor=blue,
citecolor=blue,filecolor=blue,menucolor=blue,urlcolor=blue"
     "hyperref" nil)
    ("" "attachfile" nil)))



John

-----------------------------------
John Kitchin
Associate Professor
Doherty Hall A207F
Department of Chemical Engineering
Carnegie Mellon University
Pittsburgh, PA 15213
412-268-7803
http://kitchingroup.cheme.cmu.edu



On Mon, May 5, 2014 at 8:13 AM, Roger Mason <rmason@mun.ca> wrote:

> Hello,
>
> How can I change the default packages that are used in LaTeX export?  I'm
> running Org-mode version 8.2.6 (release_8.2.6-937-g60502a).
>
> Thanks,
> Roger
>
>