I'm also a size 30 in Cast 2 and take an XS in JE cargos. Definitely size down.Man, got the cargos in charcoal in yesterday and I'm swimming in a size small. I'm a 30 in the Cast 2 and going by their size charts the small should have fit, but these are huge. Like somebody else mentioned before, I can't pull the drawstring tight enough to cinch these around my waist. No size XS left so I guess I'll be letting them go or just returning for store credit.