I use both rolls & bags(Orved) but all brands have a temperature rating so technically some are for just food storage & other for cooking.
I know what your saying with the seams sometimes splitting which usually occurs with to much heat.
The bags I have are rated to 70*c so I never boil them, I just stick to a water bath temp of no more than 75*c max & just let it heat a bit longer.
The cooking bags are a higher micron thickness & in the Orved they can go up to 115*c so they can be boiled.
www.orved.it
This is who I get my bags from, next time I get some I am going to actually get some of the thicker cooking bags myself & Im going to start putting my heat & serve food in those & use the thinner ones for
In saying that I have only ever split one or 2 bags in about 6 years but its good to have added security for sure.
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I do also make my own larger bags from the rolls as my machine has a roll dispenser inside it so I can make any length I need, you can also get the Orved cooking bags in rolls as well so I think I will get a couple as well.
www.orved.it