Bundle Pack

Every serious ComfyUI workflow eventually hits the wall where ten values need to travel together and the graph looks like a bowl of spaghetti. Bundle Pack is Nifty Nodes' answer: it packs up to 32 values of any type into a single BUNDLE wire, keyed by name, so one connection carries the whole payload. It's the same itch rgthree's Context nodes scratch, but with named keys and dot-notation nesting instead of fixed slots.

How it works

You connect values into the auto-growing slots (value1, value2, … up to 32), and each slot's renamed label becomes the key. Double-click a slot label, type seed, and from then on that value lives in the bundle under seed. This is the critical bit: the key isn't "value1" forever - it's whatever you rename it to. Keys support dot notation too, so a slot labeled camera.fov nests one level deep and render.output.format goes deeper.

The output is a single bundle socket of type BUNDLE, ready to travel anywhere - into a Bundle Unpack, a Bundle Get, or on to another Pack for merging.

Three controls matter on the node:

• count - how many value slots to show (1–32). You don't have to display all 32; set it to what you're packing.
• hide_links - hides the incoming wires on this node. Pure cosmetics, but if you're packing a dozen values, this is the difference between "clean hub" and "octopus."
• bundle (optional) - an incoming bundle to merge into. New values overwrite keys with the same name; everything else is preserved. This is how you incrementally build up a shared settings object across multiple nodes: one node adds the seed, another adds the dimensions, both merge into the same bundle.

Why you'd reach for it

Two reasons. First, decluttering: settings, prompts, flags, and model names that all need to reach a distant section of graph collapse into one wire. Second, composition: because a bundle is just a dict of named values, you can build it up in stages (Pack → Set → merge) instead of one giant Pack with 20 sockets at the top of your workflow.

Install

It's part of Nifty Nodes for ComfyUI. Manager: search "Nifty Nodes for ComfyUI" → Install → restart. Manual:

cd ComfyUI/custom_nodes
git clone https://github.com/Stibo/comfyui-nifty-nodes

Restart ComfyUI. The bundle nodes are pure Python - no models, no dependencies beyond the pack (which Manager's requirements.txt installs). MIT-licensed, built on the v3 comfy_api.latest API, and new enough (v2.1.0, mid-2026) that updating is recommended.

Gotchas

The contract between Pack and Unpack is the slot label, and it's easy to trip on. The same label must be used on both ends - Pack's renamed slot seed lines up with Unpack's renamed output seed. If you rename on one side but not the other, values quietly misalign (you'll get None on a Get, or values in the wrong output). Also, "hide_links" hides wires visually but changes nothing about data flow - don't panic when wires vanish. And remember, merging via the optional bundle input is an overwrite-on-conflict merge, so order matters: whichever node runs last with a given key wins.