Many ecommerce sellers using pick and pack fulfillment services never realize how much storage billing impacts profitability until the invoice shows up. This article explains the monthly snapshot scam, where 3PLs charge based on a single inventory count instead of actual daily usage. That means you keep paying for space long after products have already shipped. We break down the math, the warning signs, and the questions you need to ask before signing with any provider. If you want pick and pack fulfillment services that protect your margins, daily proration and same day fulfillment are the standard you should demand.