# Build Your Own Travel System \| live price, prepared checkout ## Built for shopping agents: what RoboTrunk does for every product We asked shopping agents, including Meta's Muse first-hand, what they need from a store. This is what they asked for, and what we have built. RoboTrunk is working through its catalogue, so a step may not be done for this one yet. Where a step is done per product, the line ends with what is done for this product. - **Deep research:** We read the maker's manual, independent reviews, video review transcripts and the store's own page, and publish each finding with its source and the date read. `check_product` returns them with a source for each. *This product:* 100 checked facts, checked 2026-09-18T23:04:10.595Z, in the [evidence pack](/agent/evidence/hellomockingbird-com--build-your-own-travel-system). - **Receipts:** Every published fact has a receipt showing its source quote. `check_product` and `get_product` return the checked facts that have one. *This product:* each checked fact listed below has one; the source quotes are in the [evidence pack](/agent/evidence/hellomockingbird-com--build-your-own-travel-system). - **Safety:** `check_product` asks the product-safety regulators live (US CPSC, NHTSA and FDA, Health Canada, the UK's OPSS, Australia's ACCC) whether a recall names a product, listed here or not, and flags a match with its notice; a recall never blocks the buyer. *This product:* this page holds no recall result for it yet; `check_product` asks the regulators now. - **Recall watch:** `watch_recalls` tells the buyer if a product bought here is recalled later. - **Second-hand listings:** `check_listing` runs the same recall check on a second-hand listing someone found, and adds what the listing leaves out and the price new. - **The real price:** The full price to the buyer's country, with shipping and tax, each part quoted from the store's policy or, where a part is not settled, what the total depends on: `check_product` and `search_catalog` take the buyer's country and postcode. *This product:* this store's price was read from its catalogue at 2026-10-18T19:33:40.395Z. - **A checkout that finishes:** RoboTrunk lists only stores whose agent checkout it has verified. `create_checkout` prepares the order at the store; `complete_checkout` returns a link to the store's own checkout. The checkout can be finished in either of two ways: the person taps the link in their own browser, or their agent opens it and completes the checkout. RoboTrunk checks the store's total against a budget ceiling before it issues the link. Payment always happens on the store's own page, and RoboTrunk never holds the money. No store pays for placement; RoboTrunk may earn a commission from some stores via their affiliate programs. - **Markdown copy:** Every page has a Markdown copy: [this page's copy](https://robotrunk.com/products/ucp/hellomockingbird-com/15291906850982.md). - **Photos and ratings:** Search results carry the product photo and, where the store's own page publishes one, its rating (`search_catalog`). - **Fit answers:** `check_fit` answers whether a listing fits a car, pram or bottle, with the exact quote from the store's page, or says it is not known. - **Back-in-stock watches:** `watch_back_in_stock` starts a watch on a listing the store shows as sold out; `get_back_in_stock_watch` shows when it is back in stock. - **Maker's manual:** `ask_product_manual` answers from the maker's manual with the exact passage and page, or says the manual does not cover it. - **Tools and guide:** Every tool and its description is at https://robotrunk.com/mcp; the guide is at [/agents\.md](/agents.md). - **Research from other stores:** Coming soon: reading other stores' listings of the same product as research sources. Sold and shipped by hellomockingbird\.com, hellomockingbird.com; payment happens on the store's own checkout. Brand: Mockingbird ## Variants - Default Title: USD 499.00; in stock. Variant id: `gid://shopify/ProductVariant/56402172510374` - Seller: hellomockingbird\.com. Price: USD 499\.00. Stock: in stock. Variant: Default Title, variant id `gid://shopify/ProductVariant/56402172510374`. shipping not recorded; confirmed at merchant checkout. returns not recorded; confirmed at merchant checkout. [Public evidence](https://mockingbird-prod.myshopify.com/products/build-your-own-travel-system). [Get ready to buy from hellomockingbird\.com: prepare checkout](/checkout-prepare?merchant=hellomockingbird-com&product_id=gid%3A%2F%2Fshopify%2FProduct%2F15291906850982&variant_id=gid%3A%2F%2Fshopify%2FProductVariant%2F56402172510374). ## Checked facts Each fact below was checked against the source it cites before it was published. Each carries that source's link and the time RoboTrunk read it. 100 checked facts, checked 2026-09-18T23:04:10.595Z. - compatible with: 40\+ popular models. Source: (listing), read 2026-09-18T19:39:37.273Z. - product type: travel system. Source: (listing), read 2026-09-18T19:39:37.273Z. - compatible with: 40\+ popular models. Source: (listing), read 2026-09-18T19:39:37.273Z. - warranty duration: Lifetime. Source: (listing), read 2026-09-18T19:39:37.273Z. - compatible with: 50\+ infant car seats. Source: (listing), read 2026-09-18T19:39:37.273Z. - stroller model: Single\-to\-Double Stroller 3\.0. Source: (listing), read 2026-09-18T19:39:37.273Z. - age suitability: from birth. Source: (listing), read 2026-09-18T19:39:37.273Z. - included component: Car Seat Adapter. Source: (listing), read 2026-09-18T19:39:37.273Z. - recline positions: five recline positions. Source: (listing), read 2026-09-18T19:39:37.273Z. - seat reversal: can be reversed in seconds with simple one\-touch buttons. Source: (listing), read 2026-09-18T19:39:37.273Z. - compatible with: 2nd Seat Kit. Source: (listing), read 2026-09-18T19:39:37.273Z. - seating capacity: two riders. Source: (listing), read 2026-09-18T19:39:37.273Z. - double mode compatibility: Car Seat Adapter or another infant accessory option. Source: (listing), read 2026-09-18T19:39:37.273Z. - seating configuration: forward\-facing. Source: (listing), read 2026-09-18T19:39:37.273Z. - compatible with: Riding Board. Source: (listing), read 2026-09-18T19:39:37.273Z. - sun protection: UPF 50\+. Source: (listing), read 2026-09-18T19:39:37.273Z. - canopy type: extendable. Source: (listing), read 2026-09-18T19:39:37.273Z. - leg shade: Mockingbird\-exclusive LegShade™. Source: (listing), read 2026-09-18T19:39:37.273Z. - suspension: all\-wheel suspension. Source: (listing), read 2026-09-18T19:39:37.273Z. - tire type: shock\-absorbing, never flat tires. Source: (listing), read 2026-09-18T19:39:37.273Z. - front wheels: lockable. Source: (listing), read 2026-09-18T19:39:37.273Z. - basket capacity: 25 lbs. Source: (listing), read 2026-09-18T19:39:37.273Z. - storage pockets: in\-seat pockets for parent and child. Source: (listing), read 2026-09-18T19:39:37.273Z. - fold type: one\-hand fold. Source: (listing), read 2026-09-18T19:39:37.273Z. - fold lock: auto\-locks. Source: (listing), read 2026-09-18T19:39:37.273Z. - upright when folded: stands upright when folded. Source: (listing), read 2026-09-18T19:39:37.273Z. - harness buckle: magnetic buckle. Source: (listing), read 2026-09-18T19:39:37.273Z. - harness type: no\-rethread harness. Source: (listing), read 2026-09-18T19:39:37.273Z. - harness piping: reflective piping. Source: (listing), read 2026-09-18T19:39:37.273Z. - seat type: reversible seat. Source: (listing), read 2026-09-18T19:39:37.273Z. - recline positions: 5\-position. Source: (listing), read 2026-09-18T19:39:37.273Z. - canopy height adjustable: height\-adjustable. Source: (listing), read 2026-09-18T19:39:37.273Z. - handlebar positions: 5\-position. Source: (listing), read 2026-09-18T19:39:37.273Z. - included item: Stroller frame. Source: (listing), read 2026-09-18T19:39:37.273Z. - included item: Front and rear never\-flat wheels. Source: (listing), read 2026-09-18T19:39:37.273Z. - included item: Seat with canopy, LegShade™, and child bar. Source: (listing), read 2026-09-18T19:39:37.273Z. - included item: Car Seat Adapter. Source: (listing), read 2026-09-18T19:39:37.273Z. - width unfolded: 25\.5” \(widest point\). Source: (listing), read 2026-09-18T19:39:37.273Z. - height unfolded: 40” \(wheels to handlebar\). Source: (listing), read 2026-09-18T19:39:37.273Z. - depth unfolded: 33” \(front to back wheel\). Source: (listing), read 2026-09-18T19:39:37.273Z. - height folded: 34”. Source: (listing), read 2026-09-18T19:39:37.273Z. - width folded: 25\.5”. Source: (listing), read 2026-09-18T19:39:37.273Z. - depth folded: 18”. Source: (listing), read 2026-09-18T19:39:37.273Z. - stroller weight single mode: 28 lbs not including second seat. Source: (listing), read 2026-09-18T19:39:37.273Z. - stroller weight double mode: 36 lbs with two seats. Source: (listing), read 2026-09-18T19:39:37.273Z. - minimum age: from birth with the car seat adapter. Source: (listing), read 2026-09-18T19:39:37.273Z. - seat weight limit: Up to 50 lbs for the stroller seat. Source: (listing), read 2026-09-18T19:39:37.273Z. - height limit: 42". Source: (listing), read 2026-09-18T19:39:37.273Z. - frame material: anodized aluminum. Source: (listing), read 2026-09-18T19:39:37.273Z. - handlebar grip material: leatherette. Source: (listing), read 2026-09-18T19:39:37.273Z. - animal by products: no animal by\-products. Source: (listing), read 2026-09-18T19:39:37.273Z. - seat material: heavy\-duty nylon. Source: (listing), read 2026-09-18T19:39:37.273Z. - basket material: heavy\-duty nylon. Source: (listing), read 2026-09-18T19:39:37.273Z. - certification standard: ASTM F833\-21. Source: (listing), read 2026-09-18T19:39:37.273Z. - certification: Baby Safety Alliance. Source: (listing), read 2026-09-18T19:39:37.273Z. - safety testing: lead. Source: (listing), read 2026-09-18T19:39:37.273Z. - care instruction: wipe clean with a damp cloth and mild detergent. Source: (listing), read 2026-09-18T19:39:37.273Z. - care instruction: Seat Liner can be quickly removed and thrown in the washing machine. Source: (listing), read 2026-09-18T19:39:37.273Z. - compatible infant car seat count: more than 50. Source: (listing), read 2026-09-18T19:39:37.273Z. - compatibility requirement: when using our Car Seat Adapter. Source: (listing), read 2026-09-18T19:39:37.273Z. - compatible car seat model: Baby Jogger City GO 2. Source: (listing), read 2026-09-18T19:39:37.273Z. - compatible car seat model: Britax Willow S. Source: (listing), read 2026-09-18T19:39:37.273Z. - compatible car seat model: Britax Willow SC. Source: (listing), read 2026-09-18T19:39:37.273Z. - compatible car seat model: Britax B\-Safe 35. Source: (listing), read 2026-09-18T19:39:37.273Z. - compatible car seat model: Britax B\-Safe Gen2. Source: (listing), read 2026-09-18T19:39:37.273Z. - compatible car seat model: Britax B\-Safe Gen2 FlexFit. Source: (listing), read 2026-09-18T19:39:37.273Z. - compatible car seat model: Chicco KeyFit. Source: (listing), read 2026-09-18T19:39:37.273Z. - compatible car seat model: Chicco KeyFit 30. Source: (listing), read 2026-09-18T19:39:37.273Z. - compatible car seat model: Chicco KeyFit 30 ClearTex. Source: (listing), read 2026-09-18T19:39:37.273Z. - compatible car seat model: Chicco KeyFit Max ClearTex. Source: (listing), read 2026-09-18T19:39:37.273Z. - compatible car seat model: Chicco KeyFit Max Zip ClearLux. Source: (listing), read 2026-09-18T19:39:37.273Z. - compatible car seat model: Chicco KeyFit Max Zip ClearTex. Source: (listing), read 2026-09-18T19:39:37.273Z. - compatible car seat model: Chicco Fit2. Source: (listing), read 2026-09-18T19:39:37.273Z. - compatible car seat model: Chicco Fit2 Adapt. Source: (listing), read 2026-09-18T19:39:37.273Z. - compatible car seat model: Chicco KeyFit 35 ClearTex. Source: (listing), read 2026-09-18T19:39:37.273Z. - compatible car seat model: Chicco KeyFit 35 Zip ClearTex. Source: (listing), read 2026-09-18T19:39:37.273Z. - compatible car seat model: Clek Liing. Source: (listing), read 2026-09-18T19:39:37.273Z. - compatible car seat model: Clek Liingo. Source: (listing), read 2026-09-18T19:39:37.273Z. - compatible car seat model: Graco GoMax. Source: (listing), read 2026-09-18T19:39:37.273Z. - compatible car seat model: Graco Premier SnugRide SnugFit 35 XT. Source: (listing), read 2026-09-18T19:39:37.273Z. - compatible car seat model: Graco SnugRide Lite 35 LX. Source: (listing), read 2026-09-18T19:39:37.273Z. - compatible car seat model: Graco SnugRide SnugFit LX / DLX. Source: (listing), read 2026-09-18T19:39:37.273Z. - compatible car seat model: Graco SnugRide SnugFit 35 Elite. Source: (listing), read 2026-09-18T19:39:37.273Z. - compatible car seat model: Graco SnugRide SnugLock 35 LX. Source: (listing), read 2026-09-18T19:39:37.273Z. - compatible car seat model: Joie Mint Latch. Source: (listing), read 2026-09-18T19:39:37.273Z. - compatible car seat model: Joie Rue. Source: (listing), read 2026-09-18T19:39:37.273Z. - compatible car seat model: Maxi\-Cosi Mico Luxe. Source: (listing), read 2026-09-18T19:39:37.273Z. - compatible car seat model: Maxi\-Cosi Mico Luxe\+. Source: (listing), read 2026-09-18T19:39:37.273Z. - compatible car seat model: Maxi\-Cosi Peri 180. Source: (listing), read 2026-09-18T19:39:37.273Z. - compatible car seat model: Nuna PIPA rx. Source: (listing), read 2026-09-18T19:39:37.273Z. - compatible car seat model: Nuna PIPA aire rx. Source: (listing), read 2026-09-18T19:39:37.273Z. - compatible car seat model: Nuna PIPA. Source: (listing), read 2026-09-18T19:39:37.273Z. - compatible car seat model: UPPAbaby Aria. Source: (listing), read 2026-09-18T19:39:37.273Z. - compatible car seat model: UPPAbaby Aria V2. Source: (listing), read 2026-09-18T19:39:37.273Z. - compatible car seat model: UPPAbaby Mesa V3. Source: (listing), read 2026-09-18T19:39:37.273Z. - compatible car seat model: UPPAbaby Mesa Max. Source: (listing), read 2026-09-18T19:39:37.273Z. - compatible car seat model: UPPAbaby Mesa \(2020 and newer models\). Source: (listing), read 2026-09-18T19:39:37.273Z. - compatible car seat model: UPPAbaby Mesa V2. Source: (listing), read 2026-09-18T19:39:37.273Z. - compatible car seat model: Cybex Aton M. Source: (listing), read 2026-09-18T19:39:37.273Z. - compatible car seat model: Graco SnugRide 35 Lite LX. Source: (listing), read 2026-09-18T19:39:37.273Z. The full evidence pack, with every citation, source and gap: [evidence pack](/agent/evidence/hellomockingbird-com--build-your-own-travel-system) To buy this through RoboTrunk, pass merchant `hellomockingbird-com`, product_id `gid://shopify/Product/15291906850982` and one variant_id from the list above. Product image of Build Your Own Travel System, supplied by hellomockingbird\.com: This product on hellomockingbird.com: Retrieved 2026-10-18T19:33:40.395Z from This page is published by RoboTrunk, a store built for shopping agents. The store named on this page sells the product and ships it. RoboTrunk is not the seller and never holds the money. Buying works in one path. RoboTrunk's tools prepare a checkout at that store, then hand back a short-lived link. The person approves the total; once RoboTrunk has checked the store's total against it, the person is given the checkout link to tap in their own browser, or, if the person prefers and gives permission, their agent may open the link and finish there, and payment always happens on the store's own checkout page. RoboTrunk never takes the payment or sees a card. Where the rest of this site is: - /agent/story.md is what RoboTrunk is and how it works, in full. - /agent/tools.json is every tool, its arguments and its answers. - /agent/merchants is every store you can buy from through RoboTrunk. - /products/ucp is every store's indexed products. - /products/search is one search across every store, in plain words. - [What RoboTrunk is](/agent/story.md) - [The tools and how to call them](/agent/tools.json) - [The stores you can buy from](/agent/merchants) - [Every store's products](/products/ucp) - [Search every store at once](/products/search)