Guide
How to pack a bento box, step by step
A good bento comes down to three things: the right ratio of food, a tight pack so nothing slides around, and food that tastes good without reheating. Here's how to get all three.
Start with the right box
Pick a box that holds about as many milliliters as the number of calories you want for lunch. That's an old rule of thumb that works surprisingly well: a 600 ml box packed firmly holds roughly a 600-calorie meal. Most adults land between 500 and 900 ml; young kids usually need 300 to 450 ml.
Two-tier boxes keep rice away from wetter sides. A single tier with a removable divider is easier to wash and fine for most lunches. If you'll be carrying lunch for more than a couple of hours, pair the box with an insulated bag and an ice pack (see our bento food-safety guide).
Use the 4:3:2:1 ratio
A common Japanese guideline splits the box by volume:
| Part | Share of the box | Examples |
|---|---|---|
| Carbohydrate | 4 parts | Rice, onigiri, soba or udon noodles, bread |
| Protein | 3 parts | Teriyaki salmon, karaage, tamagoyaki, tofu |
| Vegetables | 2 parts | Blanched broccoli, spinach gomae, carrot kinpira, cherry tomatoes |
| Treat or pickle | 1 part | Fruit, umeboshi, pickled ginger, a small sweet |
You don't need to measure. Eyeball it: rice takes a little less than half the box, protein a bit under a third, and the rest goes to vegetables and something small and bright.
Pack in this order
- Rice or noodles first. Press cooled rice into one side of the box at an angle, so it forms a wall the other foods can lean on.
- Then the largest protein. Set it against the rice. Firm items like salmon fillets or tamagoyaki slices act as a second wall.
- Fill the gaps with vegetables. Broccoli florets, folded spinach and cherry tomatoes plug holes so nothing shifts when the bag tips over.
- Finish with the small items. A pickled plum on the rice, a few berries, a sprinkle of sesame or furikake.
Think in five colors
Japanese home cooks often aim for five colors in a box: red, yellow, green, black (or dark brown) and white. It's a simple way to get variety without thinking about nutrition charts. Red can be tomatoes or salmon, yellow is egg, green is any vegetable, black is nori, sesame or hijiki, and white is rice.
Keep wet and dry apart
- Use silicone cups or a lettuce leaf as a barrier between saucy items and rice.
- Drain dressed vegetables well and pat them with a paper towel before packing.
- Sauces that pool (teriyaki, ponzu) should be reduced until sticky so they cling to the food instead of running.
- Pack sauces you need on the side in a small lidded container.
Cool everything before the lid goes on
Warm food sealed in a box steams, makes everything soggy, and sits in the temperature range where bacteria grow fastest. Spread freshly cooked food on a plate and let it cool to room temperature (no more than about 30 minutes for small portions), then pack and refrigerate or add an ice pack.
Bento that taste good cold
Most bento are eaten at room temperature, so season a little more boldly than you would for a hot meal and choose dishes that don't depend on being hot. Fried or glazed proteins, rolled omelets, pickles and rice seasoned with furikake all hold up well. Steamed white rice firms up as it cools; short-grain Japanese rice stays softer than long-grain, and packing it while still slightly warm (then letting the open box cool) helps.