Hobonichi Cover Sizes Explained: A5, A6, and Weeks

If you're new to the Hobonichi world—or even if you're a seasoned planner—you've likely noticed that covers come in several sizes. A5, A6, and Weeks are the three main formats, and each fits a different planner model. Choosing the wrong cover can leave your notebook swimming or crammed, so it's worth understanding the differences before you buy.

In this guide, we'll explain the dimensions and compatibility of each Hobonichi size, compare A5 vs A6 vs Weeks, and share what to look for in a leather Hobonichi Techo cover. Whether you're a daily journaler or a weekly planner, you'll leave knowing exactly which cover fits your needs.

Hobonichi A5 vs A6 vs Weeks: What's the Difference?

Hobonichi planners come in three main sizes: A5 (the Cousin), A6 (the Original), and Weeks (a slim weekly format). The A5 is roughly 8.3 x 5.8 inches, offering plenty of space for daily pages plus extra notes. The A6 is smaller at about 6.3 x 4.1 inches, making it a compact choice for on-the-go jotting. Weeks is a horizontal weekly layout that's about 7.4 x 3.9 inches—tall and narrow, perfect for minimalist planning.

The cover you choose must match the planner size exactly. An A5 cover will not fit an A6 planner, and vice versa. The Weeks format is unique; its long, thin shape means it needs a dedicated cover. Always check the dimensions of your planner before purchasing a cover, and remember that some covers are designed to fit multiple notebook brands, but Hobonichi-specific covers are tailored to these exact sizes.

• A5 (Cousin): 8.3 x 5.8 inches – roomy daily pages
• A6 (Original): 6.3 x 4.1 inches – compact and portable
• Weeks: 7.4 x 3.9 inches – slim weekly layout

Choosing the Right Hobonichi Cover for Your Planner

Once you know your planner size, the fun begins: picking a cover. Leather covers are a popular choice because they age beautifully and offer protection. When shopping for a leather Hobonichi Techo cover, consider the material, closure, and extra pockets. Full-grain leather will develop a patina over time, while a lighter finish may show scratches more easily. Some covers have pen loops or card slots, which can be handy if you like to keep everything together.

If you use an A5 Cousin, look for a cover that accommodates the thickness of the planner plus any inserts. A6 covers are often more compact, but you'll still want a snug fit. For Weeks, the slim profile means a cover with a pen loop is especially practical. Remember that covers are not one-size-fits-all across brands, so always verify the dimensions before ordering.

• Measure your planner's width and height before buying a cover
• Consider how many inserts or pens you'll store inside
• Leather thickness affects flexibility and durability

Leather Options for Hobonichi Covers

Galen Leather offers handmade leather covers that fit Hobonichi planners. For example, the Leather Leuchtturm1917 A5 Notebook Cover - Crazy Horse Forest Green is designed to fit A5 notebooks, including the Hobonichi Cousin. The Crazy Horse leather develops a unique patina and has a rugged, natural look. If you prefer a more classic style, other covers in the range come in various colors and finishes.

For A6 users, there are leather covers that fit the Hobonichi Original, though they may be listed as compatible with other A6 notebooks. Always check the product description for compatibility notes. The key is to find a cover that fits snugly without stretching the leather too much, as that can cause wear over time.

• Look for covers with a pen loop if you carry a fountain pen
• Crazy Horse leather is durable and ages well
• Check if the cover has extra pockets for cards or sticky notes

Hobonichi Weeks Cover Compatibility

The Hobonichi Weeks is a unique size, so you need a cover specifically designed for it. Many Weeks covers are slim and often come with a pen loop on the side. When shopping, look for the exact dimensions: approximately 7.4 x 3.9 inches. Some covers may also fit other slim notebooks, but it's safest to choose one made for the Weeks.

If you're considering a leather cover for your Weeks, note that the narrow shape can make it tricky to find a perfect fit. Some makers offer custom options, but a well-designed cover will have a secure closure and enough room for the planner without being bulky. Always read reviews to see how the cover holds up over time.

• Measure the height and width of your Weeks planner
• A pen loop is a practical addition for slim covers
• Check that the cover doesn't add too much bulk for pocket carry

Choosing the right Hobonichi cover comes down to knowing your planner size and how you plan to use it. Whether you go with an A5 Cousin, an A6 Original, or a Weeks, a well-fitted leather cover will protect your planner and add a touch of personal style. Take the time to measure and compare, and you'll find a cover that serves you for years.