Let me start by saying I love my K2 Pack and the accessories I purchased for it from EXO Mountain Gear. The only gripe I've ever had about this pack is it's hipbelt. Today I purchased a K3 hipbelt for my K2 pack. Wow! What a game changer! If you have a K2 pack this is a no brainer upgrade. Thicker webbing, better padding, better cinching, and better support, you just can't beat it. If you own a K2 model you need this upgrade!