What is the size besides jumbo? 17 x30” x 18” deep?

Minimum Top Opening:

18.7" x 12.2" (47.4 cm x 30.9 cm)

Maximum Top:

22.3" x 15.8" (56.7 cm x 40.2 cm)

Minimum Bottom Opening:

24.0" x 17.5" (61.1 cm x 44.2 cm)

Maximum Bottom:

27.6" x 21.0" (70.1 cm x 53.3 cm)

Height:

12.1" (30.7 cm)