Containment systems and components for animal husbandry

A rodent containment cage comprising a base and a cover, wherein:

• the cover and base are constructed from a polymer;
• the base or cover, or base and cover, are disposable;
• the base comprises walls and a bottom, which walls comprise a thickness of about 0.01 to about 0.08 inches;
• are flexible and are coextensive with the bottom;
• the base or cover, or base and cover, comprise a plurality of corners, or edges or corners and edges in the interior of the cage accessible to a rodent that can be contained in the cage, defined by surfaces having an angle α greater than 180 degrees and less than 360 degrees;
• all of the corners, edges or corners and edges present in the interior of the cage, accessible to a rodent that can be contained in the cage, and defined by surfaces having the angle α have a minimum radius φ;
• φ=0.25/(tan((π/360)(360−α))) inches;
• and
• whereby the corners, edges or corners and edges are resistant to gnawing damage by a rodent that can be contained in the cage.