Finally reached 50 posts and we would like to officially be added to the list of vendors using MBBs. :)We've been using two layers of MBBs where one of them is the Heat Seal Foil - Military Grade 1m x 1m: http://silkroadvb5piz3r.onion/silkroad/item/3e10560aef which is also the best one available at the moment as can be seen here: http://dkn255hz262ypmii.onion/index.php?topic=119458.msg1205751#msg1205751 We only ship domestically within Sweden at the moment but we plan to further our range when we have enough packaging experience and enough envelope/parcel types to not risk profiling - we will most likely add a third MBB layer as default for any non-domestic orders then.I would say after having worked with this material for a while the only possible drawbacks are user generated. In other words, bad seals due to bad sealing equipment and bad procedures for packaging which might lead to drug residue getting on the outside of a MBB are the only problems as far as I see it. From my thread Drug Imitation Materials: http://dkn255hz262ypmii.onion/index.php?topic=173839.msg1249906#msg1249906 catalan got me thinking we've might not have considered the drug residue issue to the fullest extent, we will try and implement some procedure involving using isotropic alcohol as suggested by samesamebutdifferent in http://dkn255hz262ypmii.onion/index.php?topic=119458.msg807256#msg807256 to solve this problem. ;)