Our family always re-uses gift bags, if they are in good condition. They don't have to be perfect for family members, as a general rule, because we're all very conscious of economy and resent the price of them. I will, however, make a point of buying a new one for someone outside the immediate family, but that's only because our local dollar store has some really good ones for (obviously!) a dollar, or sometimes even less. If I had to shell out five bucks or more for a gift bag, particularly for a child's birthday party gift, you can bet that I'd be re-using! (At every child's birthday party I've witnessed, the guest of honour couldn't care less about the wrappings; all he/she is interested in is what's inside!)
In this throwaway age, I try to think of it as doing my bit toward being environmentally friendly. Or maybe that's just my rationalization because I am, quite frankly, cheap, especially when it comes to forking out money on "decoration" items. (Actually, I guess I'm just cheap, in general. I don't buy clothes or shoes unless I have no option because the ones I have are, literally, falling apart. I don't wear makeup. Jewellry and accessories bore me. Um... I guess I'm missing the "shopping" gene or something! Ah, well...)