
Japanese convenience stores aren’t just places to buy bento boxes and drinks. They’re also trend hubs where you can get your hands on “Brand Books” featuring limited-edition items from popular fashion brands.
On February 18, 2026, a highly anticipated collaboration item will launch exclusively at Lawson stores nationwide and HMV&BOOKS online. This time, the spotlight is on “HYSTERIC MINI,” a brand beloved in Japan for years for its rock-inspired, pop designs. Specifically, a practical quilted bag featuring the popular “DEVILKIN” character pattern will debut.
Discover the appeal of high-quality “Brand Mooks” available at Japanese convenience stores.
1. Large Capacity! Square Bag & Sacoche Set

First, we introduce the deluxe edition featuring a large bag and a small pouch (sacoche) set.
- Release Date: Wednesday, February 18, 2026
- Price: ¥4,070 (tax included)
- Sales Locations: Lawson stores nationwide in Japan, HMV&BOOKS online
High Capacity and Versatility
The biggest appeal of this set is its practicality. The square bag’s dimensions are as follows:
- Height: 30cm (approx. 11.8 inches)
- Width: 36cm (approx. 14.2 inches)
- Depth: 19.5cm (approx. 7.7 inches)
It easily accommodates A4-sized documents and tablet devices. The generous depth (gusset) allows it to hold more than its appearance suggests.

Shape-Retaining Design
Its square shape maintains the bag’s silhouette even when loaded. Though made from soft quilted fabric, it stands upright firmly. The opening features a magnetic button closure, keeping contents discreet from view.
Unique Attachment Feature
This item has an interesting feature. The included sacoche (14cm x 23cm / approx. 5.5″ x 9.1″) attaches to the larger bag via snap buttons. This allows for three different uses:
- Use it as an external pocket on the bag.
- Use it as a standalone shoulder pouch.
- Use them separately.
The sacoche has two front pockets. These are convenient for storing frequently accessed small items like smartphones or pass cases.
2. Perfect for Outings! Mini Square Bag

Next is the mini-sized version, perfect for light outings.
- Release Date: Wednesday, February 18, 2026
- Price: ¥3,223 (tax included)
Compact Yet Ample Capacity
The dimensions are as follows:
- Height: 16cm (approx. 6.3 inches)
- Width: 19cm (approx. 7.5 inches)
- Depth: 10cm (approx. 3.9 inches)
Though compact, it has good depth. It’s designed to hold all your essential items for going out, like a long wallet, smartphone, and a 500ml (approx. 16.9 fl oz) plastic bottle.
Secure Zipper Closure
Unlike larger bags, this mini bag features a zipper closure. This keeps contents hidden and provides peace of mind regarding security, even in crowded areas or while commuting on trains. An interior pocket allows you to organize small items like keys.
Removable Strap
The included shoulder strap is detachable. Use it not only as a shoulder bag but also as a pouch or a bag-in-bag. It will also be extremely useful as a travel companion bag.
3. Common Features: DEVILKIN Pattern Quilting and Limited Edition Bonus
The common theme of this collection is lightweight “quilted fabric” and the “DEVILKIN” pattern print.


Design Features
The soft texture unique to quilting softens the brand’s edgy designs. The black-based fabric hides stains well, making it easy for everyday use.
Limited Sticker Gift
Additionally, each purchase includes one “original sticker” as a bonus. There are four designs total, and you won’t know which one you get until you open it (randomly inserted). It’s sized for use on smartphone cases or laptops. Dedicated fans might purchase multiple to collect all designs.
Summary: Check it out at Lawson in Japan
This bag, featuring a striking black and red contrast, will stand out prominently in Lawson’s magazine section. HYSTERIC MINI brand books are always popular. Especially a highly practical bag like this one could sell out quickly.
If you plan to visit Japan after February 18th, be sure to check your local Lawson or HMV&BOOKS online. It’s recommended both as a Japanese souvenir and as a practical bag for yourself.
February 18th: HYSTERIC MINI’s square quilted bag arrives! Available at Lawson and HMV&BOOKS online (Japanese Link)
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