It looks like I'll be buying a ticket on Kulula from JNB to CPT. I saw the ridiculous 7 kg rule. Is there online check-in that would alleviate the need to go to a check-in counter (where my bag would likely be weighed)? I assume if I get to the gate, I'll be OK with a standard rollerboard. Worse comes to worse, they just check it for free, right?