Les Swindin and Peter Fleming say that on their guide "Valais Alsp East" of the Alpine Club, London 1999:
Despite the benefits of hut facilities, during the high season, noise, overcrowding and increasing costs have led to a number of parties electing to camp or bivouac near by. Discreet wild camping/bivouacking is tolerated in the mountains, though officially tentes should only be erected from dusk to dawn and should be a suitable distance away and preferably out of sight of a hut. Above the snowline there is very little problem. The Swiss hava a much stricter approach to wild camping than the Italians. Whether camping, bivouacking, staying in huts or travelling through the mountains there is absolutely no excuse for not taking all refuse back down to the valley for proper disposal or recycling.