As long as the players are reasonable and don’t perpetually
carry around every firearm and toaster in creation
(with enough ammo and bread to operate them both
continuously), weights and encumbrance aren’t important.
There may, however, be circumstances where
knowing roughly how much your character can carry
may have an impact on the story—like if you break into
a vault full of heavy gold bars and need to figure out
how many guns you have to drop to haul out the maximum
amount. The rules for Lifting/Carrying, p. 152,
provide the basics, and here are some more details.
Carrying Capacity
Characters can carry their Strength x 10 kilograms in
weight without any sort of test—this is your carrying
capacity. Lifting and carrying more calls for a Strength
+ Body Test. Each hit increases the weight you can carry
by another 10 kilograms.
Encumbrance
If a character overburdens himself with gear, he suffers
encumbrance modifiers. For every 15 kilograms (or part
thereof) by which you exceed your carrying capacity,
you suffer a –1 modifier to your Physical Limit (minimum
limit of 1). This means that a character with Strength 3
(Carrying Capacity 30) that is trudging along with 50 kilograms
of equipment suffers a –2 penalty to his Physical
Limit.