Fire starter
On this page11
What it is
Cotton soaked in petroleum jelly, a wax-impregnated tinder, a gelled alcohol, or shavings and dust kept dry. A flammable preparation in a small sealed container.
Which the archetype does not describe
store-liquid-decant says thin, aqueous, cold and poured. A gelled flammable is none of those, and this leaf shares a group with five products that are.
The container has two jobs
Keep the moisture out so the tinder lights, and keep the contents in so the pack does not smell of fuel. Those are both closure jobs.
So a jar with a lined lid
218 jars on this shelf, 110 of them PET single wall and 31 PP single wall, with 26 dome lids and 19 lug and twist to close them. A wide mouth so a cold hand can get the tinder out.
PP where it might meet heat
76 PP containers. A fire starter lives near a fire, and the one time a container gets put down somewhere warm is the time it matters.
Petroleum jelly is the easy case
Not volatile, not thin, and it does not attack much. A plain jar with a lined lid is genuinely sufficient.
Gelled alcohol is not
A volatile flammable with a flashpoint, which puts it in the same rules as the fuel decant. The shop consumables property sets out the classifications and the container size limits by material.
And it evaporates through a poor seal
An alcohol gel left in a pack for a season is a jar of thickened residue. The liner decides, and 11 liners and sealing discs is the relevant line item.
Keep it away from the food
Which is a stowage point with a packaging answer: a sealed container inside a sealed bag, in a different pocket. Petroleum smell transfers to food through less than people expect.
And do not label it cleverly
A jar of flammable gel in a pack shared with other people needs to say what it is in plain words. This is the one item in the kit where somebody else might open it by mistake.