[gurpswoo1]

Many people say the same thing, that bubbles go on the inside. This is to help stop knives going through. Also it spread pressure over many bubbles.

However a knife will go through no matter which way, also the even pressure, that if enough applied will mark item.

Where as if outside they will not the mark item no matter how pressure, while still giving a great deal of protection from shocks and impact. Although I bubble wrap twice if not three times. So do outside, then inside. get best of both worlds.

The only time inside bubble is used is when you just used bubble wrap and no box. This is because the flat edge is used for paper wrap and to help against impacts. But this is when it's likely to get most pressure force on bubbles with the item most likely marked.

So I see no point in having them on inside.