Instruction: Analyze the user's review text and determine the overall sentiment expressed, then choose the corresponding sentiment option from the provided list (A: very positive, B: positive, C: neutral, D: negative, E: very negative) based on the identified sentiment.

Input:
As a flight attendant, my travel sized bottles are constantly challenged by pressurized cabins and rough handling. After many leaks using "TSA approved 3oz travel sized bottles" purchased from big box stores or drugstores, and much frustration, I chose these Nalgene bottles. They are by far my favorite yet; I haven't experienced any leaks, and they are easy to refill. They even hold oils easily without leaks, which can be a challenge. I purchased the two ounce bottles for ease of packing, as they are slightly smaller.

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