This doesn't belong in the vibrator section...
But since you asked, I LOVE packing with Silky. It's basically the only cock that I know of that is comfortable for packing, functional for fucking, and made of non-disgusting material. The key is it's flexible spine, which allows it to bend and hold different positions, like a down position for packing and an up position for fucking. The downside is that the spine can break, but Silky's not that expensive to replace every once and awhile.
There are plenty of flexible silicone harness-compatible cocks (Vixskin, O2, etc) out there that can fuck but don't pack well, and there are soft cocks (Mr. Right, Mr. Limpy, or the VIP Super Soft) that can pack but don't fuck well. And there are a few other cocks with bendable spines, but they're made of disgusting materials that leech chemicals. Silky is made of high quality elastomer, which is porous and not as good as silicone, but way better than the alternatives.
In summary: pack with Silky! He's the best!