In that picture that Cerdan posted, the Remingtons are the old-style packaging that most manufacturers used. It had a plastic tray with ten slots, and each slot held ten primers (touching each other). I have some old (>15 yrs) Federal primers that are in that style packaging.
The Winchester and CCI are the newer style that have a larger plastic tray with 100 impressions, each of which holds a primer face-up or face-down.
The Federal has a plastic tray that is about 1.5X as wide, but about four or five times as deep. It has 100 impressions, each of which holds a primer sideways.
I don't know if Federal had an accident and increased their packaging, or if they had two accidents, and increased their packaging size twice. But my understanding is that they have been through at least one iteration of this. Their trays certainly look like they are designed to to never have a chain-reaction of primers, ever again.