Welcome to TB.
Yes, you’re going to hear many people tell you why they think that’s too heavy.
The scrawny kids in your high school marching band practice standing 6-7 hours every day in the summer with 40 pound Sousaphones. Those field Tom’s are also about 45#. Scrawny Frank Zappa played a 15lb Les Paul modified. He never quit. Even Suzi Quatro (5’0”) famously says she doesn’t care about it. She plays what sounds good and hauls around a Ripper like it’s a rag doll.
My advice first is play a bass that feels good in your fretting hand and sounds how you like. If you feel you will be happier/healthier with a lesser weight bass than get one.
But do not use weight as your singular metric unless it is your top priority.
Lauren Sevian is scowling below because her sax is almost 13 pounds and they don’t make 4” padded sax straps. She’s trying to look like TJ Watt.
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15lb on Yamaha YBS-62. It does come with a peg id you play sitting down which is not part of the 15lb weight. The upside is that for Baritone players even if they are beer belly dudes, you need diaphragm support for your air and that usually equate to some muscles helping with posture. At least Lauren is tall. Kaho Takeda (classical player) is petite maybe not even 5 and she plays those Yamaha 62 series saxophones. Via FB she recommended the Breathtaking strap (from Japan). 220 bucks but it does work. I do not know if it translates to bass
I do not have any back problems but cervical issues are painful man - and a few grams matter between okay to really excruciating pain. Your tune may change if it is closer to you.