Always try to keep similar items together. Consider using plastic parts boxes, fishing tackle boxes, small cardboard boxes or Tupperware containers, etc., for the myriad of small items. These boxes are great for holding repair parts and first aid items, and for fragile items which require more protection than just a stuff sack. Packs Heavy items go in the upper section and close to the back. Medium weight items go in the center section.
Light items go in the bottom section.
Pack fuel bottles upright in outside pockets away from clothing and food. As you pack sections, keep the weight balanced on the sides. Lash tents to the top of the pack behind frame extender bar. Lash sleeping bags to the bottom of the frame under the pack. For lashing tents, sleeping bags, and foam mattresses, it's a lot easier and quicker to use straps with cam buckles or quick-connect buckles.