Skingrowsback bags are made by hand by an ex Sydney bike courier and his team down on the South Coast of NSW. They are impeccably finished and built to a bombproof standard.
Stem bags give you tons of options when touring or bike packing, you can fit an extra water bottle, or sunglasses, loads of snacks, or tool you might want to access on the fly.
Room for 1 banh mi, and probably 5 roll ups...? wait wait, at least 3 more in the outter pouch. But in all seriousness, it's internal volume is 1.6 litres.