Traps stored in the trapper's toolbox weigh more than they do outside of the toolbox.
Steps to reproduce:
1) Traps weigh 0.5 lbs
2) Traps stored in the toolbox weigh 1.0 lb
3) Your ninny-wristed DEX rogue is now overencumbered
Screenshots:
v Before v

(Note that 10.5+0.5+2.0 = 13)
v After v

(I may be a math-illiterate art student but that Does Not Look Quite Right)
Notes:
Enchanted Trapper's Toolbox when???