binding posts are overkill.
I deem them to be essential.
Dave.
I'll elaborate. The reason I thought binding posts are overkill here is simply because they are large, bulky, expensive, protruding, and generally capable of 15-30 Amps. Overkill. It's ultimately your design, and others may not think the same as me, but I'd be happy with a thinner device, not a bulkier device. I was thinking thin, not bulky, and mentioned captive or pluggable red/black cables with croc clips. As you said, it should fit inside a laptop bag. I'd like to see it just 1cm thick. Capacitive touch sliders and buttons, and a 2 line LCD, like free_electron mentions. If there's no USB data capabilities, then for sure it needs some control and display on board. Just like the binding posts, I wouldn't want to have a large rotary encoder protruding.
In my opinion, something as large as the uCurrent is too large for a laptop bag. (your prototype uSupply shows the same packaging, but I acknowledge that you might have different ideas for the final product)
If you put 4mm binding posts, I'd like to see them side mounted, not top mounted, in order to make the package ultra thin. Not much larger than the base of the binding post itself.
So there's some extra thoughts for you.
(Have you got a headache yet from everyone's different design ideas
designed by Internet committee. )
Cheers!