Made by Kobo Aizawa · Tsubame, Niigata
Stainless Steel Lunch Box: Rectangular Bento Box with Silicone Seal | KOBO AIZAWA
Meet the maker
Tsubame, Niigata
A long-established kitchen tool maker in Tsubame, Niigata — a town famous for its metalwork. Kobo Aizawa always returns to the basic...
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A timeless stainless steel bento box — simple, sturdy and made to last
Some designs never go out of style. This rectangular lunch box from Kobo Aizawa, a long-established kitchen tool maker in Tsubame, Niigata, has been a long-seller in Japan for years — and its clean, minimal form will look just as right years from now.
Why you'll love it
- 18-8 stainless steel — body, lid and divider resist scratches and rust, and won't absorb stains or odors like plastic.
- Silicone seal and side clips — the gasket and two firm clips help prevent sauces and smells from leaking in your bag.
- Easy to fill neatly — the deep rectangular shape keeps rice and side dishes in place, with a movable divider included.
- Three sizes — small, medium and large, from a child's lunch to a hearty meal.
- Made in Tsubame, Japan — the town that makes most of Japan's stainless steel tableware.
Sturdy, hygienic 18-8 stainless steel
The body and lid are made of high-quality 18-8 stainless steel. It resists scratches, rust and corrosion, so it stays in good condition even with daily use. Unlike plastic containers, it doesn't take on colors or smells, and oily residue washes off quickly. The corners are gently rounded, making it easy to clean.
Silicone seal and clips to help prevent leaks
A silicone gasket on the inside of the lid improves the seal, and clips on both sides fasten the lid firmly with a click. Together they help keep sauces and smells inside — so you can carry it in a work or school bag with peace of mind. The gasket is easy to remove and wash, so you can always keep it clean.
A simple rectangle that keeps your lunch in place
The deep, square-cornered shape is ideal for packing rice and side dishes neatly without gaps. One movable divider is included, so you can split the space wherever suits the day's menu. The minimal, no-frills design suits anyone, of any age, for any occasion.
Three sizes for every appetite
- Small (approx. 360 ml / 12.2 fl oz) — for young children, a light lunch, or side dishes and desserts.
- Medium (approx. 500 ml / 16.9 fl oz) — the most versatile standard size for everyday lunches.
- Large (approx. 670 ml / 22.7 fl oz) — for big appetites, students and athletes, or sharing at a picnic.
| Size | Capacity | Dimensions (W × D × H) | Weight |
|---|---|---|---|
| Small | approx. 360 ml (12.2 fl oz) | 130 × 115 × 47 mm (5.1 × 4.5 × 1.9 in) | approx. 170 g (6.0 oz) |
| Medium | approx. 500 ml (16.9 fl oz) | 160 × 130 × 50 mm (6.3 × 5.1 × 2.0 in) | approx. 210 g (7.4 oz) |
| Large | approx. 670 ml (22.7 fl oz) | 182 × 130 × 50 mm (7.2 × 5.1 × 2.0 in) | approx. 250 g (8.8 oz) |
About Kobo Aizawa
Kobo Aizawa is a long-established kitchen tool maker in Tsubame, Niigata, a town famous for metalwork. Their aim is to make tools that bring Japan's traditional crafts into everyday life. They always return to the basic questions of why an object exists and why it is needed — pursuing functional beauty and stripping away decoration to give their tools life.
Specifications
- Sizes: Small (approx. 360 ml) / Medium (approx. 500 ml) / Large (approx. 670 ml)
- Material: body, lid and divider: 18-8 stainless steel; gasket: silicone
- Included: 1 movable divider
- Made by: Kobo Aizawa, Tsubame, Niigata
- Made in: Japan
Care
- Not microwave safe. It is made of metal — never heat it in a microwave, as this can cause fire or damage.
- The body, lid and divider are dishwasher safe. To keep the silicone gasket in good condition, we recommend washing the gasket by hand.
- Wash with a sponge and mild detergent. Avoid abrasive cleansers and metal scourers, which can scratch the surface.
FAQ
Which size should I choose?
Medium (500 ml) suits most everyday lunches. Choose Small (360 ml) for children or side dishes, and Large (670 ml) for a hearty meal.
Can I put it in the microwave?
No. It is stainless steel, so please transfer food to a microwave-safe dish before heating.
Is it dishwasher safe?
Yes — the body, lid and divider can go in the dishwasher. Please wash the silicone gasket by hand to keep it in good condition.
The maker behind this piece
Kobo Aizawa
Tsubame, Niigata
A long-established kitchen tool maker in Tsubame, Niigata — a town famous for its metalwork. Kobo Aizawa always returns to the basic questions of why a tool exists and why it is needed, pursuing functional beauty without needless decoration to bring Japan's traditional crafts into everyday cooking.
