On the face of it a tent and/or a bivi might sound OK, being light or lightish. I think my tent is 'light enough' but when I add my groundsheet, mattress, sleeping bag, the water that I need, the rucksack that I carry and any other stuff I might need for a comfortable night, suddenly the weight rises! I personally find that its the overall weight of all the items needed for a purpose that matters, not one item. I could suggest that my tent is bomproof, it is in a way for me because I'm very careful in how and where I use it. If I wasn't careful then it would not be bombproof, neither I suspect would any other tent?