Have both Tatonka Bison 75+10 and Kuiu 6000 Pro. The Kuiu is lighter for sure by around 1kg from memory. But having done a few multi day missions with both I have to say the extra weight in the Tatonka is not noticeable in terms of carrying loads. They are very comfy packs, carry a load really well.
Where the Kuiu comes into its own is the ability to change packs over on same frame. Like @Bryan I have the 2300 as well as the big 95L IconPro
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