The built-in padding is not heavy, for example I would not trust it to protect the keyboard against a length-wise fall.

This is a great keyboard bag

Your mileage may differ of course: The NP-12 is a light, inexpensive keyboard, and I'm packing it on top of suitcases personally (not entrusting it to roadies who will throw it a van).

The built-in padding is not heavy, for example I would not trust it to protect the keyboard against a length-wise fall.

Even though it's a bit hefty, it's a good thing because it's well padded and protects my keyboard

Keeps keyboard nice and snug during transport

Works fine for my Roland RD-64 keyboard

I always buy Gator bags for all my expensive keyboards and gear.

It fit my keyboard like a glove.