Closure

1. A canister comprising

a container formed to include a product receiving chamber and a mouth arranged to open into the product receiving chamber,

a closure coupled to the container in an installed position closing the mouth, and an annular seal unit coupled to the top wall and formed to include an annular receiving channel defined by an annular plug and an outer valve, the annular plug arranged to extend into the mouth and having an outer seal surface configured to establish a first seal interface with the filler neck, the outer valve having an inner seal surface configured to form a second seal interface with the filler neck,

wherein at least one of the first seal interface and second seal interface are configured to release pressure formed in the product storage region when the closure is being uninstalled from the filler neck,

wherein the closure includes a top wall and a sidewall coupled to the top wall and arranged to extend downwardly away from the top wall toward the container, the top wall and the sidewall cooperating to define an interior region of the closure, and

a series of gussets coupled to the top wall and located in the interior region, the series of gussets reinforcing the top wall to minimize a thickness of the top wall and so that the closure withstands pressure when the closure is in the installed position, and

wherein each gusset includes a straight portion extending between the top wall and the side wall at an angle relative to a central axis of the canister and a curved portion coupled to the top wall and the side wall to couple each gusset to the closure.

2. The canister of claim 1 , wherein the top wall has a thickness of less than 0.06 inches.

3. The canister of claim 2 , wherein the top wall has a thickness of less than 0.04 inches.

4. The canister of claim 3 , wherein the top wall has a thickness of less than 0.03 inches.

5. The canister of claim 4 , wherein the top wall has a thickness of 0.03 inches.

6. The canister of claim 1 , wherein each gusset included in the series of gussets is spaced-apart circumferentially from each neighboring gusset by eight degrees.

7. The canister of claim 1 , further comprising a series of knurls coupled to the sidewall, the series of knurls reinforcing the side wall to minimize a thickness of the side wall so that the closure withstands pressure formed in the product receiving chamber when the closure is in the installed position.

8. The canister of claim 7 , wherein the series of knurls is coupled to the sidewall around an annular band.

9. The canister of claim 8 , wherein the annular band has a thickness of less than 0.04 inches.

10. The canister of claim 9 , wherein the annular band has a thickness of less than 0.03 inches.

11. The canister of claim 10 , wherein the annular band has a thickness of 0.022 inches.

12. The canister of claim 7 , wherein each knurl includes a body, a first shoulder, and a second shoulder, the body of each knurl arranged to extend away from the lid and positioned between the first shoulder and the second shoulder.

13. The canister of claim 1 , wherein each gusset has a thickness and is spaced apart from neighboring gussets by a distance and the thickness of each gusset is smaller than the distance.

14. The canister of claim 1 , wherein each gusset is spaced apart from the outer valve when the closure is in the installed position on the container.

15. The canister of claim 1 , wherein the series of gussets includes a plurality of gussets with each gusset arranged to extend in a spaced-apart circumferential relationship to one another.

16. A canister comprising

a container formed to include a product receiving chamber and a mouth arranged to open into the product receiving chamber,

a closure coupled to the container in an installed position closing the mouth,

wherein the closure includes:

a top wall,

a sidewall coupled to the top wall and arranged to extend downwardly away from the top wall toward the container, the top wall and the sidewall cooperating to define an interior region formed of the closure, and

a series of gussets coupled to the top wall and located in the interior region, the series of gussets reinforcing the top wall to minimize a thickness of the top wall and so that the closure withstands pressure formed in the product receiving chamber and the closure is in the installed position, and

wherein the sidewall includes an annular band and internal threads coupled to an interior surface of the annular band, and wherein valve passageways are formed into the annular band and the internal threads to provide gaps in the annular band and the internal threads to allow releasing of pressure from the product receiving chamber.

17. The canister of claim 16 , wherein the closure includes a first, a second, a third, and a fourth speed bump coupled to the side wall and positioned along the internal threads to engage an external thread on the filler neck to increase the force required to uninstall the closure from the container.

18. The canister of claim 17 , wherein each of the speed bumps have a thickness of less than or equal to 0.01 inches.

19. The canister of claim 16 , wherein the top wall has a first thickness and the annular band has a second thickness greater than the first thickness.

20. A closure comprising

a lid having a top wall and a sidewall coupled to the top wall and arranged to extend downwardly away from the top wall toward the container,

the lid and the sidewall cooperating to define an interior region formed in the lid, a series of gussets coupled to the top wall and located in the interior region,

the series of gussets extending downward from the top wall into the interior region to reinforce the top wall and to minimize a thickness of the top wall so that the closure withstands pressure exerted on the top wall,

wherein the series of gussets includes a plurality of gussets with each gusset arranged to extend in a spaced-apart circumferential to each other gusset, and

an annular seal unit coupled to the top wall and formed to include an annular receiving channel defined by an annular plug arranged to extend into a mouth of a container and an outer valve,

wherein the annular plug has an outer seal surface configured to establish a first seal interface with the filler neck,

wherein the outer valve has an inner seal surface configured to form a second seal interface with the filler neck, and

wherein the side wall includes an annular band and internal threads coupled to the annular band, and the top wall has a first thickness and the annular band has a second thickness greater than the first thickness.