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What is the best way to open a Premix bag?

Bags are sewn closed using either a single thread chain stitch or a double thread chain stitch.

Single thread closure is typically used on Calico bags, and double thread closure is typically used on Paper bags, but this is not always the case.

In each case the chain stitch must be unpicked from one end only, and this end is established by standing the bag such that the facing side of the bag is displaying the formed loop (multiple thread) stitches. The left-hand side of the bag is the starting point to unpick the stitch.

Cut off the excess chained thread from the side of the bag, or cut through a loop near the left side of the bag. Gently remove any loose thread.

With a single thread chain stitch closure, grasp the protruding thread on the single stitched (other) face of the bag and pull out the thread as it unlocks the last loop of the chain.

With a double thread stitch closure, the second thread loops along the facing side of the bag and acts as a safety lock, and this thread must be removed first. Do not pull any thread end on the single thread (other) side of the bag.

Find the loose thread end on the left side of the double thread face of the bag. Using a pointed object, flick out this thread from the loop that is retaining it. This will free the last loop of the chain, and the entire thread may now be removed. Now remove the other thread from the other face of the bag.