Specifications:

Height 30 * depth 30 [two fold one]]

Height 30 * depth 40 [two fold one]]

Height 40 * depth 40 [two fold one]]

Height 45 * depth 40 [two fold one]]

Height 45 * depth 50 [two fold one]]

Height 50 * depth 50 [two fold one]]

Height 30 * length 40 * depth 40 [three fold one]]

Height 40 * length 40 * depth 40 [three fold one]]

Height 45 * Length 45 * depth 45 [three fold one]]

Height 50 * length 50 * depth 50 [three fold one]]

Height 30 * length 80 * depth 40 [four fold one]]

Height 40 * length 80 * depth 40 [three fold one]]

Height 40 * length 80 * depth 40 [four fold one]]

Height 45 * length 90 depth 45 [four fold one]]

Height 50 * length 100 * depth 50 [four fold one]]