May 14, 2014May 14, 2014 Aeropress: Some Things You Might Not Have Caught That shell is for filters. In case you missed some of the subtler points of the Aeropress system, these pictures may help. Everything stacks neatly like this. The stirrer won’t scrape the bottom – dig in. That hexagonal funnel is great for pouring grounds straight from the grinder. Brewing into a small mug? An espresso cup?