Yes, I could use a large rucksack—I do have a lot of camping gear—but I was thinking this might be a more elegant, less bulky solution. Although I've seen a double gig bag for tenor ukes it was comparatively expensive and I don't recall seeing an equivalent for sopranos.
For clarity, the sort of racquet bag I'm thinking of looks like this, a couple of mostly unpadded compartments with backpack straps:
View attachment 148970
Suspect I'll have to wait until I can get to town and take a uke along to check at the shop.