My dad is seriously into bags. I mean,
seriously into bags. We cannot pass anywhere selling holders of any sort without having a peak inside.
I always thought this was really weird, but just now realised I have inherited it, in a very specific way; It is blatantly obvious to me that what you keep your GBA in says a lot more about you than what system you use. Because, y'know, there ain't much choice.
I love the "Gamester" hardwallet series; this baby suits my GBA SP to the sexay sexay ground; though usually all for Official products, the Nintendo line of holders look like shit. Made out of fishing net. And faeces.

[Gamester]
FAECES FAECES FAECES
[Nintendo]
So, Milker, what do you keep your GBA SP in?
As for my games; in my measly 128Mb cart I am holding, via PogoShell, The Lost Vikings, which I am addicted to, and Donkey Kong Country, which really sucks right now. Classic it may be, but I can't be assed with those pixel-perfect jumps on such a small screen.
I have also a NES folder, in which are some classics, none of which are working right now; and I'm getting really pissed off I can't get the link-feature to work. Theoretically Linking up two machines should allow dual-NES playability, but it hates me. Tried everything in the book, from official wires to voodoo, but nuddah. Ah, well.
What's your favourite kind of tree?