I'll go one further, everyone should use small boxes! Even bubble mailers can be destroyed. Here's a few examples of items I've gotten in bubble mailers: Listen N Fun Tripwire
The backpack peg was broken, the front of the backpack was ground down a little and the foot on Tripwire was ground down
This is the bubble mailer Tripwire came in Night Force Night Striker Sled
The window was bent and the sled itself was crushed. The sled was in a bubble mailer and was also wrapped in babble wrap!
I realise that these examples are more the exception and not the rule, but in both cases, it happened to hard to find pieces. Thank god it wasn't a Gold Head Steel Brigade figure or a Starduster