The first and most surprising fact is that there is no definitive list. The kit will vary for every member and depend upon what is planned. I have often said that the way I choose my kit, is to play the “What if....?” Game. Secondly there is no right answer nor is there a wrong answer. What you can say is: If you needed something and it was not in your piece of mind kit, then it should have been there. Just to add further confusion, the kit can vary for outing to outing dependent on many factors, such as road conditions, time of year and weather.
Firstly a few basics
Looking after yourself and your family. At this time of the year we can experience hot days and within a few hours, freezing cold wet conditions. So start your list with:
A change of clothes or at least something warm to wear. Maybe something to use to keep dry. It does not have to be a rain coat, it could be a couple of plastic bags and a few space blankets.
If anyone needs specialized medication, take a day or two supplies along, you could breakdown and have to spend an extra night / day more than planned. Closely linked is some sort of Medical Aid kit. These can vary from very basic through to extremely comprehensive and it is logical to say the contents should directly relate to your skill / knowledge of First Aid. Do not overlook the obvious, you are out in the open, be able to treat Sunburn, headaches, minor cuts, burns, upset tummies etc.
After several hours, everyone gets thirsty and or hungry. No that is NOT an excuse for an extra case of beer, but for some an extra six pack is OK ! So some extra water and some snacks go on the list.
Now the Vehicle
Obviously you must have a jack, wheel spanner and spare. But if things go badly you should have a puncture repair kit and a means to re-inflate a tyre. In certain cases a second spare and additional fuel. For when you do get stuck, a spade, a load spreading base to stop your jack sinking into the ground and not lifting your vehicle. A snatch rope or tow rope – no they are not the same thing, and essentially, very strong attachment points, both in front and at the rear. Next address what if something breaks. Answer, if you cannot fix it, carry a spare, so a spare fan belt is good. Instead of spare hoses, maybe a selection of tapes, duct, insulation and amalgamating tape, a few bolts nuts and washers and self tapping screws together with some basic tools. Some not so obvious items are spare batteries for your remote locker and as keys can get lost, a spare vehicle key. A selection of spare electrical fuses is better than tin foil or a piece of thin wire.
Choose for the trip
If your trip is going to be hot and dry what you take should be slightly different to what you need for a cold, wet and muddy, a fire fighting device for the former and something for shade.
Boots, spare socks, a means to make and light a fire for the latter.
Dont forget essentials
Chairs to sit on, a table to prepare food. On various outings, we have seen forgotten, Kettles, pots, salt & pepper, coffee, milk, eggs, tent poles, bedding , cutlery and very embarrassed people wanting to borrow one or more of these items. So perhaps this is the best example of a “piece of mind” item !
OK – Thats a start. Now ask yourself "If xxx happens what do I need?" You will quickly build up your Piece of mind kit Remember its YOUR kit not mine.