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How warm do you sleep and roughly how much sleep would you plan to have per-night?
For the price you might as well get a Hunka and try it for a few nights, figure out if it's big enough, if it's breathable enough etc. and go from there. As long as you don't trash it, you can probably resell it for ~£30 as they never have them in stock...
If you're thinking of taking a sleeping bag check out PHDesigns, they're probably the best (and lightest) you'll get in this country. The K Series is their racing line, they also have a few bags in the Bargain Box. I've got one that's rated to +5 and weights ~400g. Take the ratings with a pinch of salt, I've been comfortable sleeping at much colder temps in mine and had clothes to spare if needed. For a synthetic option I'm considering the OMM Raid 1.0, as something to use if I'm expecting rain for multiple nights.
Should probably >>>> to the sleeping bag thread for some of this...
Anyone know where to get SOL Escape OD Green bags in the UK?
http://www.ebay.co.uk/itm/Adventure-Medical-Kits-SOL-Escape-Bivvy-Breathable-Respirant-Shelter-OD-/291602146520?hash=item43e4d7a4d8:g:ddIAAOSwbqpTzlZN
This is the list of options and the SOL ones seem to be the best bang for buck, other than perhaps the Alpkit one which I reckon I'd fit into but it's a bit hard without testing all of them. Any reason to go for the Snugpack or Alpkit over the SOL? Or any reason to step up to the costly ones? They're plastic bags right, how much better are they going to be?
Alpkit Hunka, £35, 376g
https://www.alpkit.com/products/hunka
Alpkit Hunka XL, £50, 503g, 23 cm x 27 cm
https://www.alpkit.com/products/hunka-xl
https://www.alpkit.com/images/made/images/products/554/hunkasize_640_480auto.jpg
Snugpack, £55-65, 340g
http://www.snugpak.com/outdoor/accessories/bivvi-bag-2124
RAB Survival Zone Lite, £99, 224g (not waterproof)
http://www.ultralightoutdoorgear.co.uk/equipment-c3/tents-shelters-c25/bivi-bags-c41/survival-zone-lite-ultralight-bivi-bag-p120
RAB Survival Zone, £75, 422g
http://www.ultralightoutdoorgear.co.uk/equipment-c3/tents-shelters-c25/bivi-bags-c41/survival-zone-bivi-p106
SOL emergency bivvy, 107g
http://www.adventuremedicalkits.com/survival/shelter/survive-outdoors-longer-emergency-bivvy.html
http://www.amazon.co.uk/Adventure-Medical-Kits-Heatsheets%C2%AE-Emergency/dp/B000WXX0JS
SOL Escape Lite breathable bivvy, 155g
http://www.adventuremedicalkits.com/survival/survive-outdoors-longer-escape-litetm-bivvy-1.html
620g bivvy
http://www.exped.com/international/en/product-category/bivybags/bivybag-eventpu#prettyPhoto
580g sleeping bag
http://rab.equipment/uk/shop/sleeping-bags/neutrino-200
532g sleeping bag
http://www.outdoorgearlab.com/Ultralight-Sleeping-Bag-Reviews/Katabatic-Gear-Palisade-30#Weight-Packed-Size