Every brand sourcing custom packaging for the first time asks the same question: why not just order 500 units? The honest answer is that minimum order quantities are set by real cost structures in injection and blow molding production.
Custom tooling is a fixed cost that has to be spread across units. A mold that costs $8,000 to build adds $8 per unit at 1,000 units, but only $0.08 per unit at 100,000 units. Suppliers set MOQs partly to keep tooling amortization from making the per-unit price uncompetitive.
Custom color-matched or specialty resin blends (particularly for cosmetic-grade PP or PCR-content HDPE) often have supplier-side minimum batch sizes. Ordering below that threshold can mean paying a premium for a partial batch or being unable to source the material at all.
Every changeover between jobs costs a molding facility real production time: purging the barrel, swapping tooling, restarting and stabilizing the process before parts meet spec. Running a very small order ties up a machine for changeover time that isn't recovered by the order's revenue, which is why many suppliers set MOQs around what makes a changeover worthwhile.
MOQs are negotiable more often than buyers assume, especially with stock tooling. Browse the open-stock catalog to see what ships without a mold charge, or request a quote at the target volume.