Anex Huge Backpack:
30 x 20 H/W > 30 x 24 H/W
Athletics 0.9 > 1
Skill bonus -6 > -4
Combat Speed 0.8 > 0.9
Encumbrance 80% > 90%
Stealth 0.7 > 0.5
Cost 34K > 43K
Weight 13 Kg > 10 Kg

Anex Medium Backpack
18 x 20 H/W > 15 x 24 H/W
Athletics 0.95 > 1
Combat Speed 0.9 > 0.95
Encumbrance 70% > 80%
Stealth 0.8 > 0.7
Cost 18K > 19.5K
Weight 8 Kg > 6 Kg

Anex Small Backpack
10 x 10 H/W > 12 x 12 H/W
Encumbrance 60% > 70%
Weight 5 Kg > 4 Kg
New Special Deal that lowers the Price by 1 Cat!

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If it's too good or not good enough say something and I'll change it further, this has been bugging me for a while so I modified the stats.

Whenever I played games with this I never felt the need to get the backpack, now it's (Hopefully) something to look forward to in the late game!