Quick answer
Out-of-stock behavior in KitForge varies by offer type: fixed kits compute max sellable quantity from limiting components; FBT can hide unavailable add-ons; quantity breaks respect variant inventory. Checkout validation blocks overselling when stock changes between add-to-cart and checkout.
- Fixed kits use max sellable quantity from limiting components.
- FBT can hide OOS add-ons while trigger stays buyable.
- Checkout validation prevents overselling at payment.
- Inventory webhooks keep storefront availability current.
Checkout validation safety net
If inventory drops between widget add-to-cart and checkout, KitForge validation functions can block completion that would oversell bundle components — especially fixed kits with shared inventory.
Merchant workflows when stock is low
Pause kits when hero components deplete. Swap FBT add-ons to in-stock alternatives. Lower QB tier caps implicitly via inventory rather than editing tiers daily.
Readiness checklist surfaces component stock issues before publish.
Final recommendation
Out-of-stock behavior in KitForge protects merchants — max sellable caps on kits, hidden FBT add-ons, validation at checkout, and readiness checks before go-live.
If you want this kind of offer to feel native to the buying journey, Kitforge Bundles is built around that exact problem: turning related Shopify products into clearer bundle offers before the shopper reaches checkout.
FAQ
What happens if a kit component sells out mid-checkout?
Validation may block checkout or reduce available kit quantity depending on configuration and stock timing. Shoppers should see an error rather than oversell.
Should I pause kits manually when stock is low?
Max sellable often handles it automatically. Pause for merchandising control when you want to swap components rather than show unavailable.