I made up this CHECKLIST with a few friends and myself in mind.  Basically, it has everything I could think of and discover online for a day hike to a multi-day backpacking adventure to a BOB.  I'm sure you could add other items.  Please send a comment if you have other item suggestions.

O  Best quality backpack that you can afford
O  Walking/hiking shoes
O  Clothing for your environment (remember, cotton kills): jacket, windbreaker, socks, undies, pants (light weight), rain poncho, etc...your choice
O  Walking poles or walking stick
O  Weapon of choice (if you feel the need), bear spray or pepper spray
O  Hat (foldable?), gloves, jacket (might need windbreaker in warmer climates)
O  Mylar survival blanket or sheet
O  Light weight towel and blanket
O  Sleeping pad
O  Sleeping bag
O  Dry sacks
O  Tent (size to fit easily inside your backpack)
O  Flashlight (4Patriots flashlight has many functions and very bright light), headlamp
O  First Aid kit (your choice of items, tweezers, scissors, tape, bandaids, gauze, antibiotic ointment, colloidal silver, hand sanitizer, gloves, alcohol, H2O2, Moleskin, charcoal capsules, echinacea +)
O  Small sewing kit: thread (heavy duty), scissors, safety pins, needles
O  Compass (available on 4Patriots flashlight)
O  Sharpie, pencil and paper
O  Large construction bag (many uses including a tent or makeshift raincoat, etc)
O  Small garbage bags
O  Radio (Solar or windup is best)
O  Vitamins, personal medications
O  Lighter, strike-anywhere matches, or flint/magnesium lighter
O  Pocket knife (foldable), Leatherman-type multi-tool or hunting/fishing type knife
O  LifeStraw or similar water purifying item &/or water purifying pills
O  Fishing items: hooks, line, sinkers, swivels, bobbers
O  Scissors (can be in first aid kit &/or sewing kit
O  Food/snack items, hard candy, energy bars, trail mix, spices, salt, pepper, sweetener, your choice
O  Water bottle or hydration pack
O  GOT A DOG? Food, water and any other supplies
O  Emergency mirror &/or whistle
O  Walkie Talkie or similar radio
O  Cordage/rope/paracord
O  Machete, hatchet
O  Small, compact tool set
O  Money/credit card
O  Items for barter
O  Personal care items: toothbrush, paste, baking soda, salt, hairclips/bands, brush, razor, soap, shampoo, nail file, cotton swabs/balls, eyeglasses, mirror, yellow lens glasses, lipbalm, hand lotion, nail clippers, handy wipes, etc.
O  Personal ID
O  Binoculars/night vision binoculars
O  BABY? Infant or young child needs.
O  Cooking equipment, eating utensils, mini stove, can opener
O  Small amount of toilet tissue, paper towels, aluminum foil
O  Carabineers, multiple sizes
O  watch
O  Cellphone (pre-paid?), dry case, USB drive, charger
O  Dust mask
O  Tarp
O  candles or foldable lantern
O  flagging tape
O  Insect repellant
O  Work gloves
O  Maps
O  Duct tape (small roll)
O  Pocket shower
O  Essential oils like lavender and peppermint
O  Epsom salts (helps with sore tired feet)
O  Trail bidet (smart bottle with water to wash private areas)
O  Mini zip ties
O  Single-edge razor blade
O  Small bottle of ammonia or similar for insect bites
O  Solar floating lantern

YOUR TREK...YOUR CHOICE! 
Please view the 14 minute video below for some great mistake corrections!