David, a bit more details re the Aide brand kit I linked to, and why I purchased it.
Andy who stocks them is a very experienced outback motorbike rider who was also an ED nurse . I travelled through new zealand with him 18 years ago and was impressed with the amount of research and design that goes into the gear he stocks and sells. I have been abusing his luggage for the past 18 years and he has a well earned reputation amongst outback motorcyclists in Australia..
I personally have easy access to conventional dressings etc that can be used for first aid , and for many years I carried a kit that I had designed myself. Unfortunately, most dressings are not packaged with adventure travel in mind, so for my annual once in a lifetime outback motorbike trips I'd be throwing away / replacing most of the contents of that kit. Whilst I'm lucky enough to be able to do that, er, at work....there was always the concern that a dressing might be compromised when actually needed.
The aide kit was designed as an adventure first aid package - not only does it come in a robust waterproof case, but the dressings are vacuum packed to ensure they remain functional and also compact. It fits neatly into the rear storage compartment of my camelback toro ( great product, insert diversion into the benefits of wearing back protection....) , there are a few extra things I have added - eg a decent length of fixamol, which imho is your diety of choices gift to gravel rash. I also carry some fibreglass cast material, but for the average first aider it would make more sense to carry a sam splint. The extra snake bandage is a personal preference - I've had way too many tiger snakes take swipes at my motorbike boots and I guess I'm still getting my head around cycling in just shoes in Australia.....
That adventure kit Bruce linked looks nice as well, but from the images it seems to be filled with conventionally packaged products - so presumably it will be more bulky and possibly less robust. If you do manage to find an Australian distributor for those kits I'd be interested to see one in the flesh - they might be a better option for my car kit than the survival first aid kit I linked .