Q1: Is it open fire safe?
A: Hi there, it's open fire safe, pls always be cautious while handling the hot pot and use a heat-resistant glove.
Q2: Are there vent holes in lid, I don't like vent holes
A: There are no vent holes.
Q3: Will the fire Maple kettle nest inside?
A: Good construction, does what it needs to do, The fire-maple tea kettle fits inside, so you can maximize space. Without the tea kettle, you have room to fit some well-packed food to save even more room. All features in the description are true. This is a fine piece of kit. It might be a bit big for backpacking, but it's worth a try. I use it at home on the stove and out camping, so it hits my mark for utility