So, here are the bags I’ve made, firstly (as modelled by my dear husband) containing a bike and with cardboard in the inside pockets. Even I can carry it for short distances like this despite the unwieldy size, and the straps go around the bike itself rather than being attached to the bag. His right hand is just steadying the package, not actually taking any weight.
Despite making a full-sized prototype first and a mini-prototype too, the construction of the second bag incorporated several improvements based on what I learnt from the first one. I’ve made copious notes and taken lots of photos, and I’ll write it all up as a tutorial when I get the time.
The proof of the pudding will be how well these bags (and the bikes within) survive the two flights they are going to be subjected to in a few weeks’ time. I fully expect that they will sustain a few rips, but hopefully nothing that isn’t repairable. Each one, complete with the removable carrying handles and shoulder strap, weighs only about 500g, a worthwhile saving compared with Cycling UK’s heavy-gauge polythene bags. Those bags come in one size – enormous – and even when the excess has been cut off they weigh about 700g.
I made the second bag in a weekend, and I certainly didn’t spend every waking hour slaving over a hot sewing machine, so the task is not too onerous.