If you're thinking "HOLY @#$%^ It's a Medic Pack!" You'd be right. My nerdom has topped out at cosplaying the medic. Not a RED medic, oh no, those are a dime a dozen, but a BLU medic, now there's something rare. See the whole costume [link]
If you'd like to know how I constructed this monstrosity check out [link]
Want one for your very own? I'll be making them on request for $250 (includes gun and pack). Suspenders connect the pack & the gun lights up. Happy Cosplaying.
EDIT: Gun is now made with LEDs and more authentic handles for no additional charge. The LED model requires a 9Volt battery while the spotlight requires you charge the spotlight at least once a month. Gun also available in RED.
They have great mediguns!