The glass carboys from Mexico are suicide bombs in my opinion. The new ones even with Brewhaulers , milk crates and other containment devices will fracture shock ( break not from being dropped just from the weight of the liquid moving around as it is moved when filled and when moving.
As a Chemist I have not broke a single piece of glass wear in 12 years including micro thin pipettes, vacuum tubes, flasks... , yet I broke 2 glass carboys in 2 weeks ( I did contain them in padded plastic bins that contained the entire carboy as I did not trust them - NOT Milk Crates which offer no protection from this phenomena ).
If you want to go glass get the older better quality carboys. I went to a better bottle system, just easier.. lighter.. etc.