Looking at the strength of climbing gear this source indicates a modern climbing rope holds around 5500lbf.

From The Engineering Toolbox , manila hemp rope that can hold around that weight should be between 3/4 in and 13/16 in, or for the other europeans between 18 and 20mm.

This corresponds to a weight between 0.159 and 0.186 lbm/ft. For 50ft that is between 8lb and 9.3lb.

I say that 10lb is close enough.

Wait, you guys keep track of your carry weight?

Common mistake. In D&D Hempen is a type of metal, not a plant.

(I made this up, and is exactly the kind of shit I'd off-the-cuff at my players when stuff like this came up ).

In the 2024 rules, rope:

• weighs just 5lb.,
• weirdly does not specify a length (so you always have enough??),
• and is a bit harder to burst (dc20 vs dc17), but you can now use Athletics instead of pure strength

oh, and the fancy Silk rope is no longer in stock.

It's how much weight it can hold, not how much it weighs..

Edit: oh, maybe I'm missing the DnD joke

I wouldn't call that rope to begin with. It's practically string. It may be strong, but I'd like to see someone try to climb it.

In DnD, if you're carrying rope, it's something you're expected to be able to use for something like climbing. Probably at least 3 or 4 times the diameter of that.

It's heavy duty rope, maybe?

That's dry hemp rope, it won't have that strength if it ever gets wet.