Coffee beverage and methods

A single- serve coffee package has an outer envelope having one folded edge and three heat sealed edges, comprising 95% by weight materials that are compostable and demonstrate bio degradability, a filter bag fully within the outer envelope, having one folded edge and sealed edges, forming a closed envelope having opposite sides, each side comprising one layer of filter material, fully compostable and biodegradable, the filter material exhibiting a plurality of openings through the material, enabling water to pass through, the openings having no dimension exceeding a minimum dimension, a volume of grains of ground coffee within the filter bag, dimensions of the grains precluding coffee grains passing through the openings through the filter material, and an atmosphere of gas within the outer envelope, enveloping the filter bag and the coffee grains, the gas inert relative to materials exposed within the outer envelope.