Don't stress over finding the perfect bread because an authentic Vietnamese-style baguette probably won't be easy to find. Long French baguette can be cut into shape. Or use hoagie rolls. Look for bread with an exterior crust since that crunch is a large part of the banh mi experience. However, bread that is too tough will be difficult to eat. Ciabatta is another option. For homemade try this Vietnamese baguette recipe.