Vibram catalogue - http://www.vibram.com/vibramrepair/catalogo.php?id_categoria=5&livello=2&categoria_master=4
Some items are country specific.
There is also a PDF version for download at the top right of the page
In this case it sounds to be more a question of the standard and finishing of the stitching than the weight that can be carried per se. Maybe ask them to double stitch these area, just in case you ever do attempt to carry a moose.