... i have one of those GPS watch thingys from garmin, however the battery life is only about 4 hours and they arent user changeable so its not of much use...
Oh, gosh, that's a very short life! And once it's used up it has to go somewhere to be replaced? From a sales point of view I'd have though that was a non-starter but you have one.
Still, if all you need to do is get a fix now and then it could last you quite a while if you could at least switch it off when you weren't using it. All that is presupposing that the satellite constellation was still available if things got messy, which is anybody's guess.
...Do you have a response pak Ged? This kit is actually quite heavy do you recon the waist strap is up to the task? I worry the buckle might fail...
The weight is always going to be an issue. If you have any doubts about the load carrying ability of things then test them. Some of the modern day plastic buckles might surprise you. I've hung my full weight on a two inch clip that just holds a cheap parang sheath to a belt and it didn't give any sign of failing. A loop of decent two inch nylon webbing will pick up a small truck.
Yes, I have several similar kits, in different places, but they're not exactly response packs or bug-out bags or whatever you want to call them. I call them my camping kits and I use them regularly when I travel. They vary a lot in weight and the comforts that they supply. Each one except the lightest has some sort of a stove, mostly they use petrol or paraffin (pressurized) like the Optimus or Nova. The lightest is not much more than a survival kit in a belt pouch that weighs less than a kilo, and the heaviest is a full rucksack plus things like blankets, tent, groundsheets and a tarp that I keep in the car. Probably thirty kilos all in. I have a couple for the bikes (a light one for the tail pack when I'm on the Hayabusa and a heavier one for the FJR), a very light one near my indoors bench (I took that one to Pennytown Ponds today, to make coffee for me and the wife and some rice for the ducks), and in my office there's another rucksack which includes a change of clothing in a dry bag and a very lightweight tent. I'm constantly fiddling with them and adding/swapping odd bits. It's a kind of therapy.
Like you I make a list of things that I want to know I have, here's a list for travel on a motorcycle:
http://www.jubileegroup.co.uk/JOS/misc/camping.2009.06.23.txt
I use this list the most, it doubles for other travel and I just miss chunks of it out. Things like the first aid kit and survival kit on that list have their own lists. About 18 months ago I bought a Ghillie kettle, it floats around from place to place depending what I'm doing but it basically goes with me everywhere now, even on the Hayabusa.