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Grubcan Carbon 6.6 vs REI Co-op REI Traverse Modular Bear Canister

Editorial Team
Last modified at August 9, 2026
When it comes to bear canisters for backpacking, the Grubcan Carbon 6.6 and the REI Traverse Modular Bear Canister are two popular options. Both offer unique features that cater to different needs and preferences. This comparison will help you understand the strengths and weaknesses of each product, making it easier to choose the right one for your adventures.

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Grubcan Carbon 6.6REI Co-op REI Traverse Modular Bear Canister
Grubcan Carbon 6.6
REI Traverse Modular Bear Canister
Certification

IGBC approved
WMI approved (First canister to pass the official Black Bear Test)

Bear-resistant by the Interagency Grizzly Bear Committee; black-bear-resistant (certification #BB00014) by the Wildlife Management Institute

Weight

24–26 oz

Large configuration (excluding carry bag): 57.7 oz.; small configuration (excluding carry bag): 40 oz.

Capacity

6.6L

Large configuration: 686 cu in; small configuration: 412 cu in

Dimensions

13 × 7.25 in

Large configuration: 9.1 × 13 in; small configuration: 9.1 × 8 in

Locking Mechanism

Patented latching system

2 step closure system with audible clicks; buttons disengaged with finger, key, pen, or emergency whistle

Warranty

Not specified

Lifetime

Material

Carbon Fiber
Kevlar

Canister: polycarbonate; carry bag: 100% recycled ripstop nylon

Opening Size

Not specified

Not specified

Ease Of Use

Grubcan Carbon 6.6

4.2/ 5.0

REI Traverse Modular Bear Canister

3.7/ 5.0

Ease of use is crucial for bear canisters, as it affects how quickly and efficiently you can access your food and scented items. A canister that is easy to use can save time and reduce frustration, especially in challenging conditions. The Grubcan Carbon 6.6 excels in this category with a score of 4.2/5, praised for its form factor and ease of packing. Users appreciate how it fits well in and around their packs, making it convenient to carry. The REI Traverse Modular, with a score of 3.7/5, is also user-friendly but has some complaints about its opening and closing mechanism. While both canisters are relatively easy to use, the Grubcan's higher score and positive feedback make it the winner in this category.

Durability

Grubcan Carbon 6.6

4.1/ 5.0

REI Traverse Modular Bear Canister

2.4/ 5.0

Durability is a key factor for bear canisters, as they need to withstand rough handling and potential bear attacks. A durable canister ensures that your food remains safe and secure throughout your trip. The Grubcan Carbon 6.6, with a score of 4.1/5, is highly praised for its carbon Kevlar construction, which provides strength while keeping the weight down. Users appreciate its robust build and reliability. The REI Traverse Modular, with a score of 2.4/5, has durability concerns due to its plastic material, which some users find weaker and less reliable. Given the significant difference in durability scores and user feedback, the Grubcan Carbon 6.6 is the clear winner in this category.

Comfort

Grubcan Carbon 6.6

3.1/ 5.0

REI Traverse Modular Bear Canister

3.0/ 5.0

Comfort is an important consideration, especially for longer trips where you'll be carrying the canister for extended periods. A comfortable canister can make a significant difference in your overall backpacking experience. Both the Grubcan Carbon 6.6 and the REI Traverse Modular have similar comfort scores, with the Grubcan at 3.1/5 and the REI at 3.0/5. Users have mixed feelings about the Grubcan's weight, with some finding it significantly heavy while others appreciate its weight reduction compared to bear bags. There is no specific feedback on the comfort of the REI Traverse Modular, making it a neutral factor. Given the lack of significant differences and mixed feedback, this category is a tie.

Bear Resistance

Grubcan Carbon 6.6

3.6/ 5.0

REI Traverse Modular Bear Canister

2.4/ 5.0

Bear resistance is the most critical aspect of a bear canister, as it ensures the safety of your food and scented items from bear attacks. A highly bear-resistant canister provides peace of mind and meets regulatory requirements in bear country. The Grubcan Carbon 6.6, with a score of 3.6/5, is praised for its bear-resistant design and ability to store food safely. The REI Traverse Modular, with a score of 2.4/5, has some concerns about its bear resistance, with users reporting issues related to bear attacks and claws. Given the higher score and positive feedback, the Grubcan Carbon 6.6 is the winner in this category.

Packing Efficiency

Grubcan Carbon 6.6

4.1/ 5.0

REI Traverse Modular Bear Canister

3.9/ 5.0

Packing efficiency determines how well the canister can accommodate your food and scented items, affecting how much you can carry and how well it fits into your backpack. Efficient packing can make a significant difference in your overall backpacking experience. The Grubcan Carbon 6.6, with a score of 4.1/5, is praised for its spacious interior and ability to fit multiple days' worth of food. Users appreciate its form factor and the amount it can carry. The REI Traverse Modular, with a score of 3.9/5, offers a modular design that allows for flexible packing and organization. While both canisters excel in packing efficiency, the Grubcan's slightly higher score and positive feedback make it the winner in this category.

Locking Mechanism

Grubcan Carbon 6.6

3.9/ 5.0

REI Traverse Modular Bear Canister

3.4/ 5.0

A reliable locking mechanism is essential for keeping your food safe from bears and ensuring the canister remains securely closed during your trip. The Grubcan Carbon 6.6, with a score of 3.9/5, features a patented latching system that users find secure and easy to use. The REI Traverse Modular, with a score of 3.4/5, has a dual locking system with audible clicks, but some users find it tricky to operate. Given the higher score and positive feedback, the Grubcan Carbon 6.6 is the winner in this category.

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Conclusion & Final Verdict:

After comparing the Grubcan Carbon 6.6 and the REI Traverse Modular Bear Canister, it's clear that the Grubcan Carbon 6.6 is the better choice for most backpackers. It excels in durability, bear resistance, and packing efficiency, making it a reliable option for long trips. The REI Traverse Modular offers a unique modular design and a lifetime warranty, but its durability concerns and lower bear resistance score make it less appealing. If you prioritize durability and bear resistance, the Grubcan Carbon 6.6 is the way to go. However, if you value modularity and a lifetime warranty, the REI Traverse Modular might be a better fit.

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