Bike bag options for commuting to and from Airport I've got a quick trip later in the year to Italy and I'm considering biking on my full sized road bike to/from the airport at both ends of the trip. I'll have my trusty Chrome Industries Rolltop 37 with me for clothes/tools but I was wondering if there's a fold-able or collapsible bike bag that I could use to transport the bike that would be small enough to fold up in to my backpack? When I get to Italy, I'll have an 80Km cycle so it would have to be lightweight. 

An alternative and front runner for now is, getting a ride/taxi to my local airport with bike in a cardboard box (that they ship to shops in) and then hopefully obtaining a box from Safe Bag when I depart. UPDATE This is not available at the airport I'm travelling to but looks like a good product.

This is an EU to EU flight. Cost of bringing the bike on the flight will be about €100. I'm flying with Ryanair and their bicycle policy is as follows:

Bicycles - MUST be contained in a protective box or protective bike bag in order to be
accepted for travel


Bike rental is not something I'd like to consider at this time. The return flight is quite early so I'm not even sure I'd be able to return a rental I was to consider that option.

Any suggestions would be great.
You could pair a Burly Travoy with a bike suitcase if you're willing to put up with a trailer while you're touring:


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The bonus is that you get to use the bike suitcase to hold all your belongings in a nice, watertight compartment while on the road. The downside is that it looks wonky. I'm not sure if the Travoy is designed for hundreds of miles of touring. It's certainly heavier and more unwieldy than an axle-mounted trailer. And you'll likely get hit with extra baggage fees for the bike suitcase.

In any case the Travoy+bike-suitcase combo what some Bromptoneers and other folders do, albeit our bikes are much smaller and so it's actually workable since we don't pay extra fees for our bikes. Here's a youtube video of someone doing it with a Tern.


                
            

Alternately: there's nothing that stops you from doing this with another type of trailer (such as an axle-mount). Or that would stop you from designing your own bike suitcase with detachable wheels so that it turns into a trailer (or trailer into a bike suitcase):