No experience with TAP directly but I travel with a single 30L (so small enough to fit under a seat) black bag that has everything I need in it. It is small but exceeds the allowed weight on some carrier by a fair margin. Because it is fairly small, black and I carry like a back (and not a backpack) when boarding I have never been weighed, thankfully. Even on some carrier with a reputation for doing so. Basically if you are going to exceed the limit do it in a non-obvious manner and you'll probably be fine.