Synapse 25 Internal Frame

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Optional internal frames with aluminum stays designed to work with any generation of Synapse 25 that has rail loops. We present for your use these optional, removable internal fram es with aluminum stays for the Synapse 25 backpacks. The frames are made of die-cut .055” thick High Density Polyethylene (HDPE), with a nylon webbing sleeve sewn down the center that encases a 1” / 25mm wide 6061 aluminum stay. We’ve bent the stay to a generic spinal curve; we recommend you re-bend and/or adjust the curvature to best fit your own back (see here for instructions). If you just want a frame sheet, the stay is removable, though it's worth noting that a frame sheet sans aluminum stay does just about nada when it comes to shifting the weight of the pack onto one's hips. (Read more about that here in our Guide To Backpack Frames.) Show more