Heavier paper is often preferred by those who use markers or watercolors, as it prevents bleed-through. Take a look at https://lestallion.com/ and check out their journal notebooks.  Grid paper journals are favored by designers, engineers, and architects for their precision.
Refillable Leather Journals: Sustainable and Cost-Effective Solutions - Softback journals
- Green journals
 - Dot grid journals
 - Leather wrap journals
 
Hand-stitched journals are known for their durability and unique appearance. The quality of leather used plays a crucial role in how well the journal will age.
This makes them ideal for long-term writing projects or daily journaling. Eco-conscious journal companies often use soy-based inks in their printing processes.
Refillable Leather Journals: Sustainable and Cost-Effective Solutions - Softback journals
- Journal dividers
 - Vegan cork notebooks
 - Artisan leather journals
 
Recycled leather journals combine sustainability with luxury, offering a high-quality product made from repurposed leather scraps.
Refillable Leather Journals: Sustainable and Cost-Effective Solutions - Sketchpads
- Printed leather covers
 - Softback journals
 - Sketchpads
 
Custom Journals: How Personalization Enhances the Writing Experience