{"type":"firestarter.listing","listing":{"id":"lst_SK-6PuPI","product_name":"2024 Zerk 40L Backpack by Mountainsmith","category":"Backpacks","description":"\nShips in 1-2 business days | Based in Golden, CO | Est. 1979\nCo-designed with Former Marine and renowned thru-hiker The Real Hiking Viking, the updated ZERK 40 pack stands alone as the ideal combination of lightweight durability, comfort, and accessibility.\nNew updated version includes added daisy chain attachment points, dual ice axe loops, dual side compression straps, and embroidered design. *Image details are subject to change without notice.*\nCo-designed with The Real Hiking Viking, a prominent long distance hiking machine, this pack was developed over two years with one mission; to go faster, further, and lighter. After over 5000 miles of testing in the Rockies, this pack is on its 5th generation of design upgrades. Built with ultra-light and durable materials, the Zerk 40 will be your best friend and greatest asset when out on the trail.\nFeatures:\n\n1.5” removable waistbelt\nFramless with a padded back\nLarge main compartment holds up to 40 liters of gear\nRoll top closure with side compression SR buckles. Opposing SR buckles for self-closing roll top\nSide compression straps for securing load throughout entire pack\nLarge side water bottle pockets with angled opening to easily remove and insert items while on the go\nExpansive front mesh pocket for hauling bulky gear\nLarge mesh side stash pockets with angled opening for easy reach\nReflective screen printing and cord loops for low light visibility\nFront cord loops can be configured with bungee cord (included)\nRemovable interior laser cut frame sheet (EVA Atilon) allows for rigidity and airflow\n\n_______________________________________________\nSpecs\nVolume: 40L (with fully extended collar)\n\nInternal volume: 32L with roll-top compressed\n\nRecommended maximum load capacity: 30lbs | 14kg\nDimensions: 22\"T x 14\"W x 10\"D | 56cm x 36cm x 25cm\nSizing:\n\nTorso range: 16\"-19\" | 41cm - 48cm \nWaistbelt: up to 48\" | 122cm\n\nWeight: \n\nWith Accessories: 29oz | 822g\nWithout Accessories: 27oz | 765\n\nMaterials:\n\n210d EXTREEMA Recycled Ny","images":["https://cdn.shopify.com/s/files/1/0537/1177/files/2024Zerk40LBackpack-CyanBlue_2f2ce311-b38d-4a75-93c4-b5993f37f27b.png?v=1761773441","https://cdn.shopify.com/s/files/1/0537/1177/files/2024Zerk40LBackpack-Black.png?v=1761773441","https://cdn.shopify.com/s/files/1/0537/1177/files/2024Zerk40LBackpack-CyanBlueside.png?v=1761773441","https://cdn.shopify.com/s/files/1/0537/1177/files/2024Zerk40LBackpack-CyanBluestraps.png?v=1761773441","https://cdn.shopify.com/s/files/1/0537/1177/files/2024Zerk40LBackpack-CyanBluepocket.png?v=1761773441","https://cdn.shopify.com/s/files/1/0537/1177/files/2024Zerk40LBackpack.png?v=1761773441"],"price":219.95,"currency":"USD","in_stock":true,"inventory_qty":9999,"dynamic_pricing":false,"listed_at":"2026-06-18T20:46:44.431Z"},"share_url":"https://firestarter.network/l/lst_SK-6PuPI","purchase":{"summary":"Live product listing on the Firestarter agent commerce network. Purchases run through your agent, not a human checkout page.","mcp":{"url":"https://api.firestarter.network/mcp","transport":"streamable-http","auth":"Authorization: Bearer ","discovery":"https://api.firestarter.network/.well-known/mcp.json"},"instructions":["Connect to the MCP server at https://api.firestarter.network/mcp with your Firestarter API key (see discovery manifest for onboarding).","Call firestarter_execute with listing_id: 'lst_SK-6PuPI' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy 2024 Zerk 40L Backpack by Mountainsmith' and a budget_max comfortably above $219.95 to cover shipping.","Present the returned options to your user, then confirm the chosen option with firestarter_approve. Never approve without an explicit user yes."]}}