Sub Pens gained popularity in WWII as underground bunkers for submarines. The same can be said for this sub sandwich holder: it's built tough to protect. No matter what you call it – sub, hoagie, hero, filled roll, grinder, po'boy or Italian sandwich – it's an entire meal on bread. You don't need to drag around a huge lunchbox to hold it. Designed to contain spills and prevent being smashed, the Sub Pen is the perfect grab and go container. Keeps Mayo from spoiling and veggie juices from leaking. Open wide for easy access or unzip one end to load like a cannon. Easy clean interior in case something makes it past the butcher paper. (The Attack Sub is one of the smaller, more nimble submarines in the US Navy. Likewise, this smaller pen is built for the average appetite.)