if you carry a penknife and matches in your pockets then you are allready carrying survival gear so next time you go out unload your pockets into the top rucksac lid pocket instead then see what you would do without your bag.
accidents happen often to others in your vicinity, a survival tin is not meant to be a last resort item but something you can delve into for firelighting or sewing kit even a plaster.
you dont have to carry a tin its designed as an item you can just pick up and chuck in the pocket of whatever you are wearing as is a throwback to world war two escape and evasion kits which were packed in tins so they were easier to issue. if you were prepared then packing your pockets is just as good.
scout, cadets, d of e groups etc.. advise kids to get the tins because if they have the tin they they have sewing kit, plasters, whistle, compass, firekit, birth control etc... in one item they can pack. the only problem is that the leaders and instructors dont know how to teach about them properly leading to general ignorance throughout the populace. the general poor quality of a lot of kits and advertising them as SAS issue all the time doesn't help matters.