---
url: "https://onebag.travel/compare/3la3efqguy/stm-prime/dgxi6d0ot5/cotopaxi-batac-16l-daypack/"
title: "STM Prime vs Cotopaxi Batac 16L Daypack - One Bag Travel"
description: "STM Prime vs Cotopaxi Batac 16L Daypack: capacity, weight, dimensions and how many airlines accept each as a carry-on, side by side."
source: "https://onebag.travel/compare/3la3efqguy/stm-prime/dgxi6d0ot5/cotopaxi-batac-16l-daypack/"
---
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2.  [Carry-On Travel Backpacks](https://onebag.travel/carryons/)
3.  STM Prime vs. Cotopaxi Batac 16L Daypack

# STM Prime vs. Cotopaxi Batac 16L Daypack

Two carry-on travel backpacks, compared spec for spec.

## [STM Prime](https://onebag.travel/carryon/3la3efqguy/stm-prime/)

![Front facing view of the STM Prime](https://res.cloudinary.com/obt/image/upload/c_fill,w_400/v1601123578/carryons/stmprime_yfxzkc.webp)

<table class="table table-sm cmp-spec mt-2"><tbody><tr><td>Capacity</td><td>15 L</td></tr><tr><td>Weight</td><td>0.7 kg</td></tr><tr><td>Dimensions</td><td>42×26×13 cm</td></tr><tr><td>Airline fit</td><td>96%</td></tr><tr><td>Price</td><td>$80</td></tr></tbody></table>

## Feature by feature

| STM Prime | Feature | Cotopaxi Batac 16L Daypack |
| --- | --- | --- |
| Storage |
| N | Compression | N |
| None | Expanded Capacity | None |
| 0 | Opening | 0 |
| top | Passport | top |
| N | Passthrough | N |
| Carry |
| Y | Backpack | Y |
| N | Hip Belt | N |
| Y | Sternum Strap | Y |
| Inside |
| 13in | Laptop | N |
| 2 | Main Compartments | 3 |
| N | Organizer | N |
| Outside |
| × | Hard Shell | × |
| N | Rain-fly | N |
| 2, side | Water Bottle Holder | 2, side |
| Y | Water Resistant | N |

<table class="cmp-material"><tbody><tr><td colspan="2">Material</td></tr><tr><td>Polyester</td><td>100% deadstock nylon &amp; polyester</td></tr></tbody></table>

## [Cotopaxi Batac 16L Daypack](https://onebag.travel/carryon/dgxi6d0ot5/cotopaxi-batac-16l-daypack/)

by [Cotopaxi](https://onebag.travel/carryons/?brands=Cotopaxi)

<table class="table table-sm cmp-spec mt-2"><tbody><tr><td>Capacity</td><td>16 L</td></tr><tr><td>Weight</td><td>0.3 kg</td></tr><tr><td>Dimensions</td><td>48×28×10 cm</td></tr><tr><td>Airline fit</td><td>93%</td></tr><tr><td>Price</td><td>$70</td></tr></tbody></table>

## Key differences between the STM Prime and Cotopaxi Batac 16L Daypack

-   **Laptop sleeve:** 13in on the STM Prime; No on the Cotopaxi Batac 16L Daypack.
-   **Main compartments:** 2 on the STM Prime; 3 on the Cotopaxi Batac 16L Daypack.
-   **Water resistant:** Yes on the STM Prime; No on the Cotopaxi Batac 16L Daypack.

Both have: passport pocket, backpack straps, sternum strap, water bottle pockets.

## Which airlines take each bag as a carry-on

We checked both bags against the carry-on size limits of 189 airlines. 176 accept both. 5 accept only the STM Prime, and 0 accept only the Cotopaxi Batac 16L Daypack.

### Only the STM Prime fits

Air Tahiti, American Eagle, easyJet, Gulf Air, Ravn Alaska.

## STM Prime vs. Cotopaxi Batac 16L Daypack: which should you pack?

The **Cotopaxi Batac 16L Daypack** carries 1L more than the **STM Prime** (15L vs. 16L), while the **Cotopaxi Batac 16L Daypack** is the lighter pack at 0.3kg (vs. 0.7kg). For carry-on flexibility, the **STM Prime** fits 96% of the airlines we track — the higher of the two. If you prioritise packing volume, choose the Cotopaxi Batac 16L Daypack; if you want to travel lighter, the Cotopaxi Batac 16L Daypack is the better call.