I just bought a GG Kumo 36 and have found that a Therm-a-rest Z lite fits into the mesh pockets that normally hold the supplied closed foam pad. I'm thinking about swapping out the closed foam pad with the Z lite for the long hall. It fits, albeit snuggly, and provides comfortable support.
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Anyone have long term experience with this? The pack appears plenty sturdy and will likely be fine, but I'm a little worried about busting a seem.