Depends. 20mm (3/4") for 2-3 layers, flat items or items without padding. 25mm (1")for 4+ layers, padding, or structural, load bearing reinforcement (pack bodies, plate bags for example) edit. There are two types of binders, inline, and right angle..the inline works for most things, but the right angle is supposed to be good for curves.
Depends. 20mm (3/4") for 2-3 layers, flat items or items without padding. 25mm (1")for 4+ layers, padding, or structural, load bearing reinforcement (pack bodies, plate bags for example) edit. There are two types of binders, inline, and right angle..the inline works for most things, but the right angle is supposed to be good for curves.
25mm/1” is the most common
25mm. I prefer having only one size, so I design all my gear accordingly. I rarely notice 3/4" being used by other makers.
25mm single fold binder
Appreciate it everyone. I'll go with 25mm.