Biodegradable three-dimensional products molded from natural fibers

A molded fiber product produced using a split mold device, comprising:

• a threaded neck portion and a hollow body;
• wherein the molded fiber product comprises a natural fiber composition;
• wherein the split mold device is configured to deliver negative pressure to a cavity of the split mold device via a first chamber and a second chamber, wherein the molded pulp product is formed within the cavity, and wherein the first chamber and the second chamber are connected to a negative pressure source with a first suction line and a second suction line;
• wherein the molded fiber product is fully dried without heat within the cavity;
• wherein the hollow body and the threaded neck portion are of varying wall thickness, such that a wall of the threaded neck portion is of a different thickness than a wall of the hollow body, and wherein the wall of the hollow body is thinner than the wall of the threaded neck portion;
• wherein the hollow body has a substantially similar density throughout the hollow body;
• and
• wherein the threaded neck portion is unitary and integrally formed as part of the molded pulp product, and wherein the threaded neck portion does not degrade when exposed to a liquid.