Kobo Aizawa ｜ Slim rectangular lunch box

This is the "Slim Rectangular Lunch Box" made by Aizawa Workshop, a manufacturing studio in Tsubame City, Niigata Prefecture, which is world-famous for its stainless steel products. The slim shape of the lunch box makes it easy to carry in your bag. It is the perfect size for women and children. The lid is securely fastened with a silicone rubber gasket and a rubber band, so you can carry it safely even if it contains strong-smelling or slightly juicy food.

Click here for a list of Kobo Aizawa products

Slim shape

Its slim, elongated shape means it can be placed in a bag with little gusset without tipping over. It also has a divider, making it easy to serve, and is recommended for those who don't want to mix rice and side dishes. The capacity is about 350ml, making it the perfect size for women and children.

Comes with gasket to prevent leakage

The lid is fitted with a silicone rubber gasket and a rubber band to securely fasten the lunch box in place. Even if you put in a slightly juicy dish, it won't spill out, making it safe to carry around.
*It is not completely sealed, so if the food is juicy, some liquid may leak out.

Corners are easy to clean

The corners are rounded, making it easier for the sponge to reach every corner and leaving no residue behind.

Made from durable stainless steel

Made of durable, rust-resistant 18-8 stainless steel. It is resistant to the odor and color of ingredients, so you can use it for a long time.
In addition to the slim rectangular lunch boxes, we also have oval and rectangular lunch boxes.
[From left: oval lunch box, rectangular lunch box, rectangular lunch box slim]
Founded in 1922, Atelier Aizawa is located in Tsubame City, Niigata Prefecture, which is world-famous for the production of stainless steel products. The company manufactures products with a focus on beauty and functionality without excessive decoration. They continue to flexibly create high-quality products that suit the needs of modern users.
Click here for a list of Kobo Aizawa products


Its slim, long shape makes it easy to fit in your bag. The lid has a gasket and a divider, making it extremely easy to use.

[Product name] Slim rectangular lunch box
[Quantity] 1 piece
[Size (approx.)] W200 x D65 x H45mm
[Capacity (approx.)] 350ml
Weight (approx.): 212g
[Material] Body and partition: 18-8 stainless steel, packing: silicone rubber
[Country of Origin] Japan
[Notes] Dividers and rubber bands included

●Before you purchase
・You may find small scratches, black spots, unevenness in the joints, etc. Please understand that this is due to the manufacturing process.
●Precautions for use
Dishwasher: Yes, Warmer: Yes, Microwave: No
- (Before use) Wash thoroughly with dishwashing detergent before use.
・After use, wash off dirt thoroughly with dishwashing detergent or similar, then wipe off moisture and dry.
-For regular maintenance, wash with a sponge and detergent.
・Please avoid using steel scrubbing pads or abrasives as they may cause scratches.
・Avoid using or storing highly acidic foods as this may cause corrosion.
Do not store food for long periods of time.
-It is not completely airtight, so if you put something with a lot of moisture in it, the juice may leak out.
・If the food is hot, allow it to cool before closing the lid. (The lid may become stuck.)
After washing, dry thoroughly without closing the lid immediately.
・Please read the instruction manual carefully before using.