I'm not a fan of the small tin kits, but if I were going that route I'd have the contents of the Ritter Survival pack plus a Victorinox SAK, like the Farmer. Since you've got the SAK you can dump the scalpel blade and I would probably dump the fishing contents too, just because it's not really useful for short-term survival. Maybe replace the fishing kit with a small ceramic rod (for sharpening) or a mini-bic (not sure how much you can fit in an Altoids tin). Or, just dump the fishing gear for iodine tablets. You'll need water more than you'll need fresh fish in a survival situation.
Another idea, depending on your climate, is to ranger band an emergency blanket to the tin. Ranger bands also burn really well if you ever needed to get a fire started quick.
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By the way, the Ritter kit contains (directly from Equipped to Survive website):
Spark-Lite™ Firestarter - current U.S. military issue, waterproof, useable one-handed, over 1000 sparkings in tests
4 Spark-Lite™ Tinder-Quik™ - current U.S. military issue, waterproof, wax impregnated cotton tinder in zip-top plastic bag, each burns 2-3 minutes
Fox-40® Rescue Howler™ Survival Whistle - designed exclusively for this kit, triple frequency, exceeds U.S. Coast Guard and SOLAS specifications, bright yellow with dual mode lanyard hole
Rescue Flash™ Signal Mirror, 2 x 3 inches (5 x 7.6 cm) Lexan™ polycarbonate with mil-spec style retro-reflective aiming aid for one-handed use, instructions on back, protective cover to prevent scratches while stored in the kit, lanyard hole.
20mm Survival Compass - liquid damped with groove to accept an improvised lanyard ring
Duct Tape - 26 inches x 2 inches (66 x 5 cm), rolled around plastic mandrel, repairs, first aid, the ultimate repair and improvisation component, uses limited only by your imagination
Stainless Steel Utility Wire - 6 ft. of .020 inch (1.83 m x 0.5 mm) mil-spec grade, stronger than brass, won't get brittle in frigid cold, multiple uses
Braided Nylon Cord - 10 ft. (3 m) 150+ lb. (68+ kg) test, won't unravel, shelter building, repairs and much more
#69 Black Nylon Thread - 50 ft. (15.2 m), 10.5 lb. (4.8 kg) test, repairs, fishing line, light duty lashing and much more
Fishing Kit - 4 x medium Fish Hooks, 2 x Split Shot and 1 x Snap Swivel, in a clear plastic vial with cap.
Heavy Duty Sewing Needle - will penetrate heavy materials, easy to grip, large eye for easy threading
4 Safety Pins - repairs, secure items to prevent loss and much more
Heavy Duty Aluminum Foil - 3 sq. ft. (0.9 sq. m), make container to boil water, reflect fire heat and much more
#2 Pencil and Waterproof Notepaper - 2 pieces 2.125 x 3.667 inches (5.4 x 9.3 cm), leave notes, memory aid, keep log
#22 Scalpel Blade - stainless steel, in sealed foil packaging, more functional than a single-edged razor blade
Fresnel Lens Magnifier - 2 x 3 inches (5 x 7.6 cm), in protective sleeve, read small type in survival instructions if glasses lost, start fire using sun