Since my favorite type of pen, which are very short pens that fit everywhere and don't take much space isn't in the list, my recommendations go for Penco Drafti

Since my favorite type of pen, which are very short pens that fit everywhere and don't take much space isn't in the list, my recommendations go for Penco Drafting Pen and the Penco Bullet Pen. Penco.jp is also a pretty cool website. I have no affiliation with the brand other than really liking these two pens. I must have about 12 bullet pens in different pockets of jackets and pants so I'm never without a pen.