It depends on what characteristic of the CD case is being measured: its mass, linear dimensions, volume, transparency to light (or other electromagnetic radiation), its brittleness, etc.
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The metric unit commonly used to measure the volume of a CD case is cubic centimeters (cm³) or cubic millimeters (mm³).
To convert tonnes to liters, you need to know the density of the substance. For water, 1 tonne is equal to 1000 liters. So, in the case of water, 45 tonnes would be 45,000 liters.
A centimetre, unless I wanted a very precise value (why?) in which case I would use a millimetre.
You would use grams (g) or kilograms (kg) to measure the weight of a homemade chocolate chip cookie in metric units.
The SI unit used to measure volume is the cubic meter (m^3). In this case, 1 liter is equivalent to 0.001 cubic meters, so a 2 liter soda would have a volume of 0.002 cubic meters.
A cubic meter is a unit of volume; a metric ton is a measure of mass. Depending on what is in a particular cubic meter, the mass may vary between close to zero (in a vacuum), and billions of tons (in a neutron star). For example, a cubic meter of water has a mass of 1 ton, a cubic meter of lead, about 11 tons, a cubic meter of gold, about 19 tons. In every case, you have to multiply the volume with the density of whatever fills the cubic meter.A cubic meter is a unit of volume; a metric ton is a measure of mass. Depending on what is in a particular cubic meter, the mass may vary between close to zero (in a vacuum), and billions of tons (in a neutron star). For example, a cubic meter of water has a mass of 1 ton, a cubic meter of lead, about 11 tons, a cubic meter of gold, about 19 tons. In every case, you have to multiply the volume with the density of whatever fills the cubic meter.A cubic meter is a unit of volume; a metric ton is a measure of mass. Depending on what is in a particular cubic meter, the mass may vary between close to zero (in a vacuum), and billions of tons (in a neutron star). For example, a cubic meter of water has a mass of 1 ton, a cubic meter of lead, about 11 tons, a cubic meter of gold, about 19 tons. In every case, you have to multiply the volume with the density of whatever fills the cubic meter.A cubic meter is a unit of volume; a metric ton is a measure of mass. Depending on what is in a particular cubic meter, the mass may vary between close to zero (in a vacuum), and billions of tons (in a neutron star). For example, a cubic meter of water has a mass of 1 ton, a cubic meter of lead, about 11 tons, a cubic meter of gold, about 19 tons. In every case, you have to multiply the volume with the density of whatever fills the cubic meter.