Light 3D mesh - not to heavy to be useful.
Carefully created textures based on 360 degrees photo scan. Flatscans sometimes used If needed.

Accurate dimensions, taken from existing, previously bought product -using caliper if possible to measure diameters etc. - no guessing or working with internet-photos only.

There is a light source in the scene to show clearly how objects behave in different lighting conditions.

Easy to reduce the amount of polygons because of simple and uncollapsed structure:
----spline
+ lathe modifier
+ uvw cylindrical mapping
(in this case top of the cap has different map and uvw mapping assigned, but it's still easy to tweak)

You can reduce interpolation in spline modifier or/and
reduce number of steps in Lathe modifier depending on your needs/ power of your machine/time left before deadline :).

If you are in real hurry - you can give up transparency and
work only with diffuse and reflection glossiness maps - propably much faster renderings.

Only quad polys.
Product bought in 2020.

Enjoy!!