I have a Marmot bag that has been in steady use since 1983 and it has served very capably. It is a little worn now, but I still take it on backpack trips. Marmot gear is very high quality.

I have not used a "bean bag," but their items that I have used have been very good. They have an iron clad guarantee, so you could probably return it with no problems.

Which is the lightest? That would be crucial for me.