What type of rosin bags are the best for my pressing needs?

We took the time to research which types of rosin bag constructions were good and which ones were….. not so great.  The construction of the bag is so important because it is a huge factor in reducing blowouts and it is what keeps your material inside the bag.  However, there are many different types of bag stitching (and non-stitching) on the market making it confusing what to choose.  We broke it down to a simple list for you:

  • Stitchless Rosin Bags
    • Ultrasonic Seaming – We did not like our findings on these types of bags… This bag construction requires welding and when the bag material heats up, it is plasticized.  The ultrasonic heat causes frictional heat by high frequency waves.  These type of bags tend to cause blowouts often so our recommendation is to stay away from these bags. 
    • Thermal Bonding – This type of bonding is formed by heating thermoplastic materials then applying pressure, which causes it to stick together.  After some time, the material cools down and becomes solid, which forms the type of stitchless seal on the bag.  These type of bags also caused a good amount of blowouts, but not as much as the ultrasonic seaming.
  • Sewn Rosin Bags
    • Single Stitch – This is the traditional method used to make rosin press bags.  This is the strongest method of rosin bag construction, but can tend to let plant material to flow through the seam.
    • Double Stitch – Gutenberg’s Dank Pressing Co. uses this double stitching method that keeps the plant material in the bag not passing through the seam while also being amazingly durable.

Here at Gutenberg’s Dank Pressing Co., we want our customer to have a great experience while rosin pressing.  Our rosin bags are washable and reusable, made of 100% food grade nylon, and double stitched to produce the great yield.


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