snickerdoodle is the size of a standard US business card: 2.0″ x 3.5″ (50.8mm x 88.9mm) – more detailed dimensions can be found here.

Here are some typical weights (+/-0.1g):

snickerdoodle (Zynq-7010), connectors up: 32.6g
snickerdoodle (Zynq-7010), connectors down: 31.0g
snickerdoodle black (Zynq-7020), connectors up: 33.2g
snickerdoodle black (Zynq-7020), connectors down: 31.8g
copperHead heatsink: 9.4g
32GB microSD card: 0.3g

And the baseboards:

breakyBreaky v3.0: 71.3g
adhesive-base locking PCB support (four are provided with breakyBreaky): 0.6g