Spiritus Systems talk about when you will consider using tactical back panels or backpacks in this episode... "There are a lot of misconceptions about how, when, and where to use back panels on your plate carrier. In this video Adam goes over some important considerations you should account for when deciding between a back panel and a backpack for tactical applications."
BigCroc compares the Spiritus System MK4 and the replica from Emerson Gear to find out if there are differences... "Quick comparison between the real deal and Emerson replica. Its' up to you to decide whether it's worth it, but do support the real thing if you have the budget!"