My Save-A-Dive bag has evolved into something like a regulator bag with lots of pouches -- a hanging toiletries bag? Anywho....
Side A
Mesh Pouch: mask strap, fin straps with buckles
Zippered Pouch: computer instruction book and zipties
Side B
Four Pockets containing ziplock bags of: O-rings for computer, tank; spare mouthpiece and zipties, snorkel keepers; heavy needle and nylon thread, bolt clips and quick clips; valve stem remover; first stage plugs.
Strapped in: multi-purpose tool, allen wrenches, crescent wrenches
Side C (has hanger strap)
Zippered Pouch: buddy line, extra parachute cord, extra wrist strap, marker pens
Zippered Pouch: pocket reef guides, Sea Gold, Swimmer's Ear, Bonine, Neosporin, clippers, silicone grease, anti-fog wax.
Extras added: 50 ft and 100 ft lines for dive flag, magnifying page, spare mask in box
Things we have actually used: Sea Gold, Swimmer's Ear, Bonine, Neosporin, zipties and clippers, dive flag lines, buddy lines, computer booklet, reef guides, clips, marker pens, extra cord. Richard has used the tools working on BC inflate valves.
All this started from a simple SAD cylinder!