cb_custom
by ccbbc
cb_custom adds drift bottles, a message system where players write a note, seal it in a bottle and throw it into the world for someone else to find.
What it does
A drift bottle carries a message from one player to another. A player writes the content, throws the bottle, and it can be received in single-player worlds as well as on multiplayer servers. Players can reply to a received bottle or ignore it. Once the number of replies reaches a set threshold, the exchange is kept in a memorial album that stays available across servers, so the conversation becomes part of the player's record of past game times.
The system is split into a communication part and a game effect part. Some bottles, when opened, trigger random in-game effects, and the contents of each bottle can be benign or malicious. Two optional functions exist: the random effects and the cross-server album can each be disabled manually in the configuration file if a server owner prefers not to use them.
The mod is released under the MIT License and is not open source. It runs on NeoForge 1.21.1 only and needs to be installed on both the client and the server, so every player on a server that runs it needs it too. The latest NeoForge file is 1.21.1-0.3.0, released on 2025-12-01.
Key features
Drift bottle messages
Players write their own content into a bottle and throw it, and other players can receive it in the world.
Reply or ignore
A received bottle can be answered or left unanswered, so each exchange stays under the recipient's control.
Random effects on opening
Opening some bottles triggers random in-game effects, and the bottle contents may be malicious.
Memorial album
After enough replies, the exchange is saved into a permanent album that persists across servers.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Who it’s for: Players who want asynchronous messages inside a Minecraft world, and server owners who want an optional message feature that can be switched off in the configuration file.
How it compares
Hearts In A Bottle is server-side only and released under the Mozilla Public License 2.0, which is open source. Messages In a bottle shares the client and server environment of cb_custom but is released under All rights reserved and is not open source. Only Bottle Caps is also client and server and is licensed under Creative Commons Attribution No Derivatives 4.0, so it is not open source either.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| cb_custom | NeoForge | 1.21.1 | Client and server | 2025-12-01 |
| Hearts In A Bottle | NeoForge | 1.21.1 | Server-side only | 2024-12-14 |
| Messages In a bottle | NeoForge | 1.21.1 | Client and server | 2026-01-24 |
| Only Bottle Caps | Fabric and NeoForge | 1.21.1 | Client and server | 2026-09-06 |
Questions
Does cb_custom need to be installed on the server?
Can the random effects be turned off?
Which NeoForge version does cb_custom target?
In the catalog
cb_custom is one of 29,952 Game mechanics mods on ModsFinder, and one of 12,140 Game mechanics mods for NeoForge. 32,366 mods support Minecraft 1.21.1.
Similar mods
What the author says
This mod adds a fun asynchronous communication system featuring drift bottles, with core features as follows: - Cross-scenario interaction: Receive drift bottles thrown by players worldwide in single-player mode or multiplayer servers; - Random experience: The contents of the bottles may be kind or malicious, and…
Official listing
- Modrinth page
- modrinth.com/mod/cb_custom
- Owner
- ccbbc
- Published
- 2025-11-21
- Updated on Modrinth
- 2025-12-01
- Facts verified
- 2026-10-15