Post office postpak size 0 bubble envelopes are tough durable and protective the bubble bags have a high quality white paper exterior containing a lightweight bubble lining ensuring contents are transported without the risk of damagepostpak bubble envelopes will make sure your post stays safely enclosed and protected size 0 is perfect for sending a cd photographs or anything that can flex without breaking such as a small book or leafletsthe postpak bubble envelopes are a great choice fo