The 4" Monoprice Cable I have for my Anker Astro2 works in my Apple Leather Case with a little bit to spare.
Good to know!
I know the 4", and have read the 3' Monoprice have no problems. The 6ft is very tight but still fits.
Here's what I posted in another thread:
Finally measured the Lightning ends with an old dial caliper. It's essentially accurate to 0.001 give or take a hair. Monoprice cables were purchased a couple weeks ago. All fit my 5s Apple Leather Case with no interference and no popups.
Apple OEM 3ft cable: 0.300"x0.182" (came with my 5s)
Apple microUSB to Lightning adapter: 0.408"x0.192"
Monoprice 3ft cable: 0.408"x0.228" (black)
Monoprice 6ft cable: 0.428"x0.227" (white)
Apple Leather Case Lightning opening: 0.460"x0.230" (measured to just shy of any resistance moving the caliper blades since the leather "gives" a little)
Hope this helps anyone curious.