I used to not care about my notebooks. I would duct tape them as they fell apart and get a new one once it filled up.
But I finally gained an attachment to a notebook brand completely by accident - stumbled upon a blank 500 page grid miquelrius notebook in my dads old bookcase and have been using them ever since. Thick but flexible - I feel like I've found the bible of sketchbooks (they also have spiral bound and a ton of other sizes if you have different preferences) - http://www.shopmiquelrius.com/
I used to not care about my notebooks. I would duct tape them as they fell apart and get a new one once it filled up.
But I finally gained an attachment to a notebook brand completely by accident - stumbled upon a blank 500 page grid miquelrius notebook in my dads old bookcase and have been using them ever since. Thick but flexible - I feel like I've found the bible of sketchbooks (they also have spiral bound and a ton of other sizes if you have different preferences) - http://www.shopmiquelrius.com/