There is a saying that the whole numbers are the work of God, and all else (negatives, decimals, fractions, rationals, irrationals, imaginaries, complex, hypercomplex, algebraic, transcendentals, hyperreals, computables, superreals, surreals, etc. numbers) is the flawed work of man.

Therefore 1.5 is pants.

The best policy would therefore be to number the Systainers after their heights rounding off any fractional stuff - Sys-105, Sys-157 etc. With that there is no possible confusion and we stay safely with whole numbers.