From the Bog Dog team:
HYDRA CELL 600ml – Soft flask, compressible bottle
– 42mm large opening to facilitate filling
– High flow silicone bit valve
– Circular bottom without angles : more resistant to abrasion and puncture, it will slide perfectly in your pack pockets
– Volume: 600ml / 20oz
– PU / PP / SILICONE / POM
– BPA + PCV + PHTALATES FREE
– Soft body, compressible, dish washer safe
– Dimensions: 230x80mm
– Weight: 44g