well we are using DM genie, so I can easily keep track of their weight, and before walking in the front door of the dungeon, they were all on the verge of being medium loads.
Also, on a site note, under the spellbooks section of the intro it says that spells like web are devastating and be careful to allow them, since they didn't allow the bad guys to have them. However the kobold wizard my group encountered in their first session had web prepared and it was in his spellbook...