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Are two person bags generally considered too small and better to go for a four person?
It depends on your priorities. I prefer to have a lightweight bothy bag that is cosy for two, rather than to try and control a large flappy section of fabric in a four-person version. For example, my Rab Superlight Shelter 2 is made of silnylon, weights only 255g, and packs away to the size of a grapefruit so I am not tempted to leave it home (which I would with a 620g 4-person polyester standard-weight version). In between these extremes are standard-weight two-person bothy bags that adds a plastic window at 320g, or a lightweight 4-person silnylon without window also at 320g. Terra Nova offer a similar range of models, though their 4-person silnylon version weights 400g.
Personally, I smile each time I pack and reach out to bring the grapefruit sized lightweight one. Plus, its warm orange colour is pleasant to sit inside on a dull grey day.
We got a bit lost in the clag coming down off Ben Chonzie yesterday. A total pea souper, was OK on the way up to the summit following the line of the fence posts, but returning we followed them a little too far without peeling off for the path. Spent 15-20 mins retracing our steps and picked the path up again. No harm done.
Which reminded me, I've been meaning to get a bothy bag for ages, and that's kinda spurred me on, as if we'd have taken any longer it might have been nice to stop, make a brew and have a proper look at the map and just get out of the wet cloud for a bit.
Are two person bags generally considered too small and better to go for a four person?