Uwatec X-Black Manual page 27

Each pocket can be loaded with up to 12 lb (5.5 Kg) of SCUBAPRO Ecoweight above the
size "L" and up to 10 lb (4.5 Kg) in the sizes below (see assembly procedure, fig. 4-1, 4-2),
and each back pocket can be loaded up to 5lb (2.25 Kg).
Performance is listed below and printed in the interior patch stitched on the BC.
Sizes
XS
S
M
L
XL
*N=Newton
26
Max Lifting Buoyancy (N*)
140
140
210
280
310
Max Lifting Buoyancy (lb)
31.5
31.5
47.2
62.9
69.7
Max size of bottle (I)
18
10 10
10+10