Hello @srednivashtar ,
while your pedalboard case BCB-30X has the dimensions of
width 330 mm
length 307 mm
height 100 mm
and the Boss SY-200 has the dimensions of
width 101 mm
length 138 mm
height 65 mm
both pedals should fit in the case.
Hope that info helps.
Greetings and God bless, Marius