I wouldn't personally recommend any on the page you showed me. The best bivi bag to buy depends on how much you feel you'll be using it. So if you think you'll be using it just occasionally or you need one for emergency situations, then I'd recommend a basic British Army issue one. It is a goretex bag with a pull string at the top. So you slide right down inside the bag and draw the top up. You can get them on ebay very cheaply from anywhere between £25 - £35 (which is a real gift in terms of value). Here's an example... http://www.ebay.co.uk/itm/British-Army-Surplus-style-Bivi-Bag-MUST-SEE-… Here's another... http://www.ebay.co.uk/itm/Genuine-Issue-British-Army-Gore-Tex-Bivi-Bivv… I tend to do a lot of wild camping - it's something I love. One of the drawbacks with the simple version is that you can't see out and it can feel a little claustrophobic at times if you're right down inside. Plus because you can't seal the top perfectly, if you're in a humid environment where there are mosquitos or midges, then they can get inside - that happened to me in the Med once so I resolved to buy a hooped bivi bag with a mosquito net built in. I bought the best on the market (not the most expensive by the way). It's the dutch army issue one and is used by British Special Forces who tend to buy their own. I paid £120 for mine. This is what it looks like... Here is one through a surplus store. They're selling a range, although be careful because some are without the curved-snap-together-pole which keeps the bivi open at the head end. The ones with the pole cost £99... http://www.surplusandoutdoors.com/shop/camping-equipment/outdoor-tents/… Hope this helps!