That DK game is probably the best value at the high tier as a prize, they did that one last year too and I got it.
Most their 'supplies' and in particular the bags (that one, pikmin, star bag, etc) have always been disappointing and small, more for show than carrying stuff.
I ordered that green zelda bag too, not a word still out of them. I'll probably end up shoving my GB Color or the New3DS in it, not really sure.