Sorry, but I don't think any of the presented stuff is a "must have"... One of my hobbies is "survival in extreme conditions". So I know from experience that none of the presented stuff is a bare necessity. If I leave that aside, I still like the arrow rifle and the small stove shown last that can generate electricity, but I wouldn't spend money on those either, because I suspect that they will break down ridiculously quickly, especially since they are more than likely made in China, or at least they are assembled from parts made in China somewhere else. I've been trying to use things I make myself for a while now... They're certainly not as beautiful as store products, but at least I know them exactly; I know that if they break, I can make new ones instead; they are not exposed to the risk of "built-in obsolescence"; they are cheap; individual, i.e. special, unique, suitable for expressing my individuality; I enjoy making them; I feel proud when I use them; and in general, objects made by ourselves have a "soul"! And anyway, the more you know, the less stuff you need...that is, the less desire you feel to buy these kinds of high-tech gadgets. Especially at such high prices of over $100...