Stab into center then cut out along direction of blade it’s not too tricky once you’ve got the hang of it, just use a sharp knife. The sharper the less likely you are to cut yourself. Which reminds me I’m due for my quarterly visit to my friendly local blacksmith for a sharpening (dude teaches at one of the local schools and does knives as a hobby and to make extra money)

No matter how many “solutions” I am offered I am still mildly infuriated by the bags.😅… I just cut them open with scissors, part of my irritation is the need for extra apparatus, whether to open or to reseal .