NEWS & PRESS
New Arrivals: Tsuyoiko Glass L Size
Introducing L Size in the “Tsuyoiko Glass” Series!
We are excited to introduce the new Tsuyoiko Glass L to our series. The capacity is 240ml, offering a larger volume compared to the S size (130ml) and M size (185ml). With the addition of the L size, which is perfect for children who are starting to find the M size too small, as well as for adults. The Tsuyoiko Glass series offers four types: S, M, and L-sized glasses, plus a bowl. These are designed for use by both children and adults.
What inspired the development of the new L size?
The original Tsuyoiko Glass lineup included two sizes—S and M—as well as a bowl, all designed for easy use by young children. However, a customer survey conducted through ADERIA’s official Instagram revealed strong interest in a slightly larger glass. Many users expressed a desire for a size that could also be used by adults.
These responses highlighted a broader need: a glass that could be shared by both children and adults. Based on this feedback, we decided to develop the new L size to meet those expectation. By creating the L-size glass, we aimed to make the Tsuyoiko Glass series suitable for the whole family. This supports the important concept of “commensality”—enjoying meals together as a family while having meaningful conversations, which is essential in food education.
The Story Behind the Tsuyoiko Glass:
The Benefits of Using Real Glass Cups in Early Childhood
In many households, glass tableware is considered too fragile for children; it is often replaced with plastic alternatives for safety and convenience. In fact, that very fragility plays an important role in helping children grow — not just physically, but emotionally and sensorially.
The Tsuyoiko Glass was created by a nursery teacher and certified food education advisor who believes that children should grow up using real, natural materials. Handling glass teaches care, respect, and awareness — qualities that plastic can’t offer.
Rather than shielding children from fragile items, we should teach them to handle objects with care. Real glass provides an opportunity for children to develop a sense of responsibility and attentiveness by experiencing its texture, temperature, and clarity. These small, daily interactions foster a meaningful connection with the tangible world.
Eating isn’t just about nutrition. It’s a sensory experience that shapes how we feel about food. Just like rice tastes better in a ceramic bowl or soup feels warmer in a lacquered cup, juice feels fresher in a glass. Tableware matters — even for little hands.
4 Key Features of Tsuyoiko Glass
1. Easy to Hold Design and Perfect Size
The glass features a narrow waist at the middle and a stepped shape on the bowl, making it easy for small hands to grip securely. It comes in three sizes, allowing users to choose the perfect volume for their needs.
2. Ion-Strengthened Glass with Dishwasher Safety
Tsuyoiko Glass is made using ion-strengthened glass technology, which significantly improves resistance to cracking and chipping compared to regular glass. It is also dishwasher safe, making daily cleaning simple and convenient.
3. Made in Japan with Reliable Safety and Quality
Manufactured by Ishizuka Glass Co., a company with over 200 years of history, Tsuyoiko Glass has been produced under strict quality control in Japan since its launch in 2007. This ensures safety and consistent high quality for everyday use.
4. Environmentally Friendly Packaging Supporting Social Causes
The packaging uses “Colorful Wish®” paper, made by recycling origami cranes sent to Hiroshima Peace Memorial Park. This eco-friendly choice reflects our commitment to peace and a healthy environment where children can grow happily.
*“Colorful Wish®” is a registered trademark of Crown Package Co., Ltd.
Explore the Full Tsuyoiko Glass Series!
Alongside the Plain type, you can also find other playful designs in the Tsuyoiko Glass series — including Nico, Hide and Seek, and Panda.
Tsuyoiko Glass nico
Tsuyoiko Glass – Hide and Seek
Tsuyoiko Glass Panda’s Bathhouse
↓ Come and Check Our Latest Collection in Shoppe Online! ↓
Shoppe Online – ISHIZUKA GLASS (ADERIA)
Their online marketplace, Shoppe Online, runs 24/7, 365 days a year. They introduced a new season that comes with updated brands and products every six months; the next season will launch on July 15, 2025. You can also find our products on the Shoppe Online site, purchase them directly there.
↓ If you have any inquiries or questions, please feel free to contact us !↓
~ABOUT US~
ISHIZUKA GLASS started in Japan in 1819.
In the 1960s, we started producing glass tableware and named the brand “ADERIA”, derived from the name of the Adriatic Sea, known as one of the birthplaces of glass. Since then, we have produced long-life design products, believing that only honest and timeless design would never be thrown away, and last beside people forever.
