Since we now play exclusively at my house, I no longer need to bring everything in a backpack with me. So my campaign binder is actually just a series of pocket folders, in which I keep the following:
- My PC tracking sheet, which has each PC/NPC's AC, touch AC, flat-footed AC, hp, spell slots, alignment, level, and ability scores, with space to jot in temporary modifiers (like spells currently in effect on each PC), plus a spot to track initiative for each battle
- My monster stat sheet(s) for the current adventure
- The adventure itself, written up in the same format as Dungeon magazine (some habits die hard), including read-aloud boxed text as needed
I also have a separate folder for the NPC druid (which gets passed to whoever's playing her that particular session). Each player has a six-part folder with the details of their PC (character sheet, attack matrices for their various weapons, a class abilities and feats sheet, equipment listings, and spells/familiars/animal companions/druid wildshape forms/etc. based on their specific class needs). And I have my five card boxes with my homemade initiative cards for the PCs/NPCs/monsters encountered, my under-the-bed storage container with our D&D Minis, my two dresser drawers of homemade battle maps made on the backs of used desk calendar pages, plus a closet full of homemade 3D props/buildings, most of them made of cardboard or poster board.
I also have two bound notebooks for each campaign, one college ruled for jotting down adventure ideas and one of graph paper for the adventure maps.