Thanks to all for your input. Had a change of mind and ordered
A Nemo Gogo,  will let you know how it performs.

Hi - am planning my first proper bikepacking trip in the next couple of weeks and am pondering over sleep system/bivi bag choice. I'm going to be riding in the Highlands of Scotland which have ferocious midges (small biting flies which swarm) and my current bivi bag has no fly netting so I'm thinking of getting a hooped bivi with some mosquito netting so i don't have to have myself sealed in all night - my choices so far are either an Outdoor Reserch  Alpine Bivi or a RAB ridge raider (http://www.cotswoldoutdoor.com/index.cfm/product/rab-ridge-raider-ep/fuseaction/products.detail/code/76110048/group/864/level/2). Anyone got any experience of either of these or would like to recommend something else ?

Scotland (my home turf) is full of routes. For starters there's the West Highland Way (and the still to be claimed double) and this can be linked to the Great Glen Way to give approx 170 miles of pretty stunning riding. Also it's possible to ride across to Dalwhinnie from either Fort William or via the Corriearick Pass and then into the Cairngorms and East Coast or out to the Moray Firth via the Speyside Way. There's also the Kintyre Way - if you google bikepacking the Kintyre way there's a good post out there. In the South you could do the Southern Upland Way, rode some of this on Trans-Scotland a few years back and it's more remote and better than you would think.

Just a few suggestions..... 

Just been wondering about doing a proper trans-scotland next year.
Potentially you could start in the South West nr the start of the Southern Upland Way, head up through dumfries, moffat and peebles (enjoying some 7stanes trails in the process) and then into edinburgh, cross to the West Highland Way "WHW" (via the Forth and Clyde Canal), go to Fort William, then up the Great Glen Way as far as the Corrieairick Pass, over to Dalwhinnie, Aviemore and then up the Speyside Way to finish (whew).

This would take in some truly awesome terrain and probably take the best part of ten days riding.

Alternatively you could start in Oban, head up Loch Etive to Glen Kinglas then to Victoria Bridge, up the WHW to Fort William then head over to Aviemore, cross the Cairngorms and head for somewhere on the East Coast (possibly going over Mount Keen?).

Anyone from the UK done any of this stuff - my only experience so far has been the WHW over 2 days.

It strikes me that we've got some major terrain up here and some great routes that would make for some "epics"

Pretty sure this can be done - I remember reading an account of it in the UK magazine Singletrack. Why don't you mail the guys there and ask which back issue it's in - I think you can purchase them online.

Good luck