SY-15-SP is made of CPLA, i.e. crystalized poly lactic acid, which is made of corn starch and chalk. The chalk added is to ensures a heat-resistance up to 80 degrees. Meanwhile, it doesn’t affect its biodegradability at all.
For bulk-packed items, it can be 50pcs x 20bags =1,000pcs/master carton, or 100pcsx10bags=1,000pcs/master carton or even 1,000pcs/bag/master carton, at same cost as you prefer.