Just the two, one for each bass! First a plain black leather, with straplocks, the other, a leather one I’ve had for around 50 years which I use on the EB3.
Always been a fan of Joe Brown, so the latter is adorned with small horse brasses, which I copied from JB's on his 335 Gibson back in the day.
The unfortunate bit is that to fix the brasses on, the strap ceased to be adjustable, so in recent years I’ve had to rivet an extension onto it.......