I have a GHB in my vehicle (and a similar one in my wife's van) which is my main bag.
It's long:
Emergency Devices
Small Multi-tool
One pair of lightweight gloves
20’ – 550 parachute cord
10x25 Binoculars
Hearing protection (ear plugs)
Eye protection (tinted for use as sunglasses and/or clear lenses)
Large folding knife (4" blade) and/or fixed blade knife
$20.00 (20 x $1.00)
Extra mag for handgun (if you choose)
Duct tape around one of the water bottles
Wire saw with rings
Wet Wipes (small, travel size)
Radio (battery or crank type)
Small hand shovel, folding (U-Dig-It type)
SAS survival guide (for family members/spouse who is not as knowledgeable as they should be)
Fire/Light
2 – LED flashlights (with flashlights - two is one, one is none)
Extra batteries (2 x AA)
2 – Lighters
5 – Vaseline coated cotton balls in Ziploc bag
Flint and magnesium fire starter and/or lifeboat matches
Signaling
Signal mirror
Emergency Whistle
Signal strobe light (w/ extra battery)
Shelter/Protection
Mylar lined survival sleeping bag/blanket
Hat
Sunblock
Chapstick with SPF protection
Poncho/rain jacket & pants
Insect repellent
Food/Water
Canteen type cup
1 pack of coast guard rations (recommended) or 3-4 energy bars
5 – Drink mixes
2-liters of water (2 x 1-liter bottles)
Potable aqua tablets/water filter
Medical
First aid kit including:
Some band aids
Ibuprofen & Tylenol (small bottle)
Benadryl tablets (or other antihistamine)
Pressure bandage
Moleskin
Hand Sanitizer
Super Glue
Direction finding
1-2 Compasses (two is one, one is none)
Local map
Miscellaneous
Pencil/Sharpie
Notepad/paper
Toilet paper (1/2 roll)
I also keep a Kel Tec Sub2000 with a 17rnd and 33rnd Glock magazine in a waterproof bag in the backpack.
I'm using the LA Police Gear 3-day backpack in the clearance section that is only $30. It is an AMAZING bag for the price!
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