Ok so ive thought for a few days wether to post or not and err here goes
So before we start putting lists together you yes YOU need to do some pre planning and take in a variety of possible situations that may arise.
First of all SHTF : What would cause you to leave you home rapidly ? As most on here I think live in an urban environment,
RIOTS also for both city and country dwellers
Floods and for people living abroad also the possibility of
Forest/Mountain Fires Catastrophic storm systems
These are the most realistic scenarios that your going to face and for the people involved
it is a SHTF moment. Now the lucky part for you, is that if not immediately, there will be emergency services/military units on hand to help you within a few days. For this list I will take it that you all ready know where you are going or your secondary RV point.
So you need that grab bag for a weeks survival tops tbh but if you ration yourself you can make it last a lot longer.
This is what I would personally take in the UK, I'm not going to need a weapon for this.Also the UK is not short of water.
A decent size Bergen to start, then fill that fucker up.
Tactical Assault Vest- google it.There are so many versions out there take your pick. The amount of pockets they have and you can fill with all light items, plus items you will need immediately to hand.
Maritime Flares- expensive but worth there weight in gold
Decent knife/small axe- axe will double as a hammer, make sure very sharp
Tent/ground sheet(or) bivi bag/sleeping bag - easy shelter to keep you out of the weather. Tents these days fold up to a very small package so a must for me.
Fire steel, lighters/Candles - steel as the back up, use your lighters, remember its only for a short term. I always carry the cotton wool balls mixed with vaseline to give you a 2 min burn when lighting fires.
Water purification ( plus I would always boil water)- especially in flooded areas, sewage dead humans/animals etc
Food- now remember you have to hump this food on your back, each to there own but I like rice/pasta and chocolate for moral. Sweeties

nothing like a nice sweet to cheer you up. Its all about the moral at the end of the day
Utensils by this I mean something to cook your food in and something to eat it with. I always used the metal cup on the water container.Most gadget survival knives come with a eating utensil on it.
Torch- wind up and battery- don't forget the batteries you can get loads from a £ shop in the UK.
Radio - wind up or battery ( optional to take) shrugs shoulders
Insect repellent- depending on location
Clothing-now I sacrifice 8 changes of clothing for food, who gives a fuck if I stink when rescued I certainly don't. 1 change would suffice for me.Extra socks wont go amiss though + a towel to dry items with

Remember the seasons though, as you may need to take extra clothes in the winter.
Talcum powder for you feet and ass

Look after them feet
Emergency First Aid kit think about the situation that may arise, so pain killers(lots and strong ones), light plasters, heavy bandages for sprains, some clean film for burns(riots/fires), sterilized needle and thread.
You tailor the list to your specific needs
Para cord/utility rope-15m again rolls down to nothing , so several lengths, also in the £ shop
Documents- if you have your documents in one place in a house don't forget to put them in a water proof bag and take them. Would save a lot of hassle in the future if you can keep them. Insurance docs, cards, birth certificates,passports, what ever you deem vital documentation.
This is not a definitive list, add , take away do what the fuck you like to it, but that would do me for several weeks

Remember though, that this is for the Emergency that will be resolved within several days and the most realistic scenarios that will befall somebody on here.
Children over 5 can carry small bags on there backs as well. Do they not go to school with a mini rucksack with books in it?? Light items, but never give everybody your only means of fire or water purification, spread it around the family unit.
So when I get chance Ill do something else for a real SHTF scenario !!