The FB1225 is more rigid than the FB610 or other gig bags as it’s 25mm padding.
Still possible to flex it but very heavily padded keeps it’s shape
The internals have a bass strap pin locator to keep bass from moving and two adjustable Velcro neck supports
Outside it has a nice storage pocket for strings, tools etc
The outside top and base have reinforced protection to.
Its a great bag for £67 !