Reply to Bags

Alright so i got an s4, midi fighter, mb 13", and just got an apc40 and need a bag. I was looking at the UDG slingbags for just the s4 and the apc that can go over a trolley bag and they seemed pretty cool, but they didn't say anything about waterproof and thats gonna be important because im gonna be in chicago and don't want any snow to damage my babies. The creator trolley by UDG seemed cool but idk, as far as the mono bags, i was looking at the 365 for the apc. I was gonna get a DJTT s4 bag but they stopped making them so yea.. I was wondering if anyone knows of any other bags by these companies that'll fit one or the other or even both. I just need something thats gonna be good for walking around in chicago and something that i can take as a backpack on a plane or carryon.

i was believeing of getting the 365 (bookbag) for the apc and a sling for the s4 (carry on)

plane fees are trying to be avoided, $100 if your checked bag is over 50lbs so yea..