The Gator GB-4G-UKE-SOP gig bag is specifically made for soprano ukuleles, as described in the manufacturer's product info. It has some pretty good protective features, like 20mm of interior padding with GFLEX foam to guard against bumps and falls. There are also padded backpack straps and a contoured back for more comfortable carrying.

From what we found, folks like the way it's built and the tough materials. Features like the front pocket for accessories and internal reinforcements for headstock and bridge areas are also really appreciated. There's even a Pick-Clip for spare picks. These are nice touches to keep your ukulele safe.

But you're asking about a concert ukulele. The catch is, this bag is really meant for sopranos, so a concert ukulele might be a tight fit, or it might not fit well at all. Our research suggests it's crucial to check the measurements of both your ukulele and the bag to see if it could work.

So, this gig bag is a great choice for sopranos if you're traveling to lessons or gigs, or just playing at home. If you have a concert ukulele, you might want to look at other options in Gator's 4G series that are better suited for concerts.

Always verify the dimensions before deciding, so you're not stuck with a bag that doesn't fit. Hope that helps you find the right case for your ukulele!