It's not only very convenient, but it is also delicious, because most of these ekiben are made with a large variety... When you're in Japan, don't miss the opportunity to taste in train a few ekiben variants. You won;t regret it!
EXIF info:
Nikon Df
Lens: 24-70mm F/2.8G
Focal Length: 40mm
Aperture: F/3.2
Shutter Speed: 1/60s
ISO Sensitivity: ISO 2000