Heya all.. another weird question!

I've got Root Nurse fabric pots, which seem to have excellent reviews. I bought a saucer to go underneath for drainage but it seems to just sit snugly into it and I can't see when it's leaking out the bottom! I have thought I could pop the bag on 4 blocks to raise it up from the run out.

What are you guys (& girls) doing about drainage for these pots? (the one I have is 12L currently and I plan on it being my final grow pot)

Thanks in advance,
Subtle