How to Use a Splash Bivy for Fast Ultralight Overnights
By Hyperlite Mountain Gear | Lightweight, Durable Outdoor Gear | Published: 2026-10-16
Category: How-to Guides
Learn how to set up and use a Splash Bivy for fast, minimalist overnights. Step-by-step guidance on pairing, pitching, and staying dry without a full tent.
Quick answer
To use a Splash Bivy for fast ultralight overnights, pair it with a tarp or Ultamid 1 for full weather protection, or use it alone on dry nights. Set up your tarp first, then position the bivy underneath, stake out the bathtub floor, and secure the bug netting. Always check the forecast and choose a sheltered site to minimize condensation.
Why choose a bivy for fast overnights
A bivy sack like the Splash Bivy offers a lightweight, compact alternative to a tent when you want to move fast and keep your pack ultralight. It provides bug protection and a waterproof bathtub floor, but it is not a freestanding shelter. For dry nights, it works on its own; for wet or windy conditions, pair it with a tarp or an Ultamid 1. This modular approach lets you adapt to the forecast without carrying a full double-wall tent.
Pairing your Splash Bivy with a tarp or Ultamid 1
The Splash Bivy is designed to integrate with the 8'6" square or 8'x10' Flat Tarp, or the Ultamid 1. When using a tarp, pitch it low and taut to shed wind and rain, then place the bivy underneath. The bivy’s tall bathtub floor walls provide reliable coverage, but they are not a substitute for a full tarp in heavy rain. If you expect relentless bugs, consider the UltaMid 2 Mesh Insert, No Floor, which adds NoSeeUm mesh protection to your Ultamid 2. For solo trips, the UltaMid 1 Insert transforms your Ultamid 1 into a double-wall tent with mesh netting and a waterproof Dyneema® Composite Fabrics bathtub floor.
Pitching the Splash Bivy: site selection and setup
Choose a site that is flat, free of sharp objects, and naturally sheltered. Clear away rocks and twigs. If using a tarp, pitch it first, then lay the bivy underneath. Stake out the bathtub floor corners to keep the walls upright. The Splash Bivy weighs just 5.55 oz for the Regular and 6.29 oz for the Long, so it packs down small. Avoid pitching in depressions where water might pool. If condensation is a concern, leave a gap between the bivy and tarp for airflow.
Using the Splash Bivy on its own
On dry nights with low bug pressure, the Splash Bivy can be used alone. Its bathtub floor and mesh netting keep you protected from insects and ground moisture. However, it does not offer full rain protection, so always check the forecast. If there is any chance of rain, bring a tarp. For minimalist overnight shelter, the bivy alone is incredibly light and fast to set up—ideal for fastpacking or bikepacking where every ounce counts.
Bivy vs tent for fast packing: when to choose which
A bivy like the Splash Bivy excels when you want to minimize weight and bulk, and when you can rely on a tarp for weather protection. A tent, such as the Ultamid 1 with the UltaMid 1 Insert, offers more interior space, easier entry/exit, and better condensation management. If you prioritize speed and simplicity, the bivy is a strong choice. If you expect prolonged rain or need room to spread out, a tent may be worth the extra weight.
Step-by-step Splash Bivy setup
- Check the forecast and choose your shelter combination: If rain is likely, bring a tarp (8'6" square or 8'x10' Flat Tarp) or an Ultamid 1. On dry nights, the Splash Bivy alone may suffice. Mistake: assuming the bivy is fully waterproof—it is not a substitute for a tarp in sustained rain. Decision checkpoint: Will there be rain or heavy bugs? If yes, bring a tarp or insert.
- Pitch your tarp or Ultamid first: Set up your tarp or Ultamid 1 in a sheltered spot, pitched low and taut. This provides the primary weather protection. Mistake: pitching the bivy first and then trying to fit the tarp over it, which can lead to a poor pitch. Checkpoint: Ensure the tarp is secure and can withstand wind before moving on.
- Lay out the Splash Bivy and stake the bathtub floor: Place the bivy under the tarp, oriented with the head end into the wind. Stake out the bathtub floor corners to keep the walls upright. Mistake: not staking the floor, which allows the walls to collapse and reduces protection. Checkpoint: The bathtub floor should be fully extended and taut.
- Secure the bug netting and adjust ventilation: Zip the mesh netting closed to keep bugs out. If condensation is likely, leave a small gap between the bivy and tarp for airflow. Mistake: sealing everything up tight, which can lead to condensation inside the bivy. Checkpoint: Balance bug protection with ventilation based on conditions.
- Organize your gear and settle in: Keep your pack and shoes in the bivy’s vestibule area (if using a tarp) or outside under the tarp. Avoid bringing wet gear inside the bivy. Mistake: storing sharp objects inside the bivy that could puncture the floor. Final check: Ensure you have a headlamp and essentials within reach before zipping up.
Product facts
- Splash Bivy: The Splash Bivy weighs 5.55 oz for Regular and 6.29 oz for Long, with tall bathtub floor walls for reliable coverage. This ultralight weight and floor design make it ideal for fast overnights where bug protection and ground moisture resistance are key.
- UltaMid 1 Insert: The UltaMid 1 Insert transforms your UltaMid 1 Tarp into a double-wall, single-person tent system with 22.2 sq ft of space, mesh netting, and a waterproof Dyneema® Composite Fabrics bathtub floor. If you already own an Ultamid 1, this insert adds bug and splash protection without the weight of a separate tent.
- UltaMid 2 Mesh Insert, No Floor: The UltaMid 2 Mesh Insert, No Floor, is made with NoSeeUm mesh and fits slightly smaller than the perimeter of the UltaMid 2 to minimize condensation. For Ultamid 2 owners, this insert adds bug protection with minimal weight and condensation, ideal for ultralight pursuits.
