Looking to buy a "two man" bivvy. I've got a Solace 60" HD brolly for quick overnighters and day sessions which is fine, but want something a little more substantial as I am thinking of doing a weeks drive 'n survive next year. I don't want to spend a fortune as it's only going to be used once in a blue moon, and the idea of a two man is that I'm going to have a lot more room if used on my own (likely) but if push comes to shove I could squeeze another bedchair in in an "emergency". Th