Instruction: Carefully assess the user's review for any strong expressions of sentiment, either positive or negative. Based on your analysis, select the most fitting sentiment option from the provided list as output.

Input:
I vacuum pack many food items.  I have found that the 8 inch roll size is ideal for packaging individual burgers, chicken breasts, etc.  It is very convenient.  The larger size is also good, but I do not use it as much. However, I have a couple of rolls of the larger size as well.

The material is thick enough to protect the food.  It seems to always seal.  Every once in a while, the bag does not properly work.  I have to stop the process and reposition the bag with the food.  It always works the second time.  I do not know if it is the bag or the positioning in the device that causes it to sometimes fail.  I gave it four stars instead of 5 because of that.

Options:
A: very positive
B: positive
C: neutral
D: negative
E: very negative
Answer: B: positive