In about a month or two I'm going to be getting a ~6 month old mexican black kingsnake and can't decide which exo-terra "snake cave" to get for it's current size(not sure actual current length) and for full grown. Dimmensions/sizes are as follows.
Small 160 x 115 x 73 mm / 6.2" x 4.5" x 2.8"
Medium 218 x 130 x 90 mm / 8.5" x 5.1" x 3.5"
Large 250 x 190 x 120 mm / 9.8" x 7.4" x 4.7"

Thanks!