I've gotten a few bulks lately (I imagine that the manner of packaging may change) but currently:
4Noggins - (One bulk, 4oz), heavy zip lock (nicely packed). Label (may come off).
Pipe Place (pipetobacco.com) - Gawith Hoggarth mixtures, 500 gram, all in factory plastic in a paper box.
PipeGuys - Samuel Gawith Full Virginia Flake, 250gr, factory plastic, paper box in shrink wrap.
SmokingPipes - regular zip lock, Cornell & Diehl 4oz to 8oz, with peelable labels.
Pipes and Cigars - regular zip locks with labels (may come off). Stokkebye Luxury Navy Flake (1-1/2lb) in paper box with shrink wrap.
Hope that helps.