BIIB BI-91-Yellow Knife
- Knife
- Aluminum
- 2.1 ounces
- Small
- More reviewed than 88%
A small, sturdy aluminum utility knife for everyday box and package cutting, not a replacement for a full-size job-site blade.
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How it ranks among the 246 knifes we track
4.5★ across 7,400 Amazon ratings, Bayesian-smoothed toward the category average.
7,400 Amazon ratings, weighted on a log scale so huge counts don't drown everything.
2,000+ bought on Amazon last month.
Brand identity, imagery, description and spec coverage.
The ProductDome score is separate from the Amazon rating shown above: it combines the Bayesian-smoothed Amazon rating with evidence volume, tracked demand, and data quality across the 246 knifes we track - how the scorecard works · full knifes data report. Confidence: high - strong rating volume and complete data.Last refreshed Aug 4, 2026. Data-computed, not a hands-on test. Compiled by the ProductDome Research Team.
Overview
The BIIB BI-91-Yellow is a small aluminum-body knife weighing 2.08 ounces, sized for quick cutting tasks rather than heavy-duty work. Its yellow finish and small size point to a utility cutter meant for easy visibility and one-handed use.
Built with an aluminum body instead of plastic, it favors a firmer grip over the lightest possible weight. The small size classification fits pocket or drawer storage over a full-size shop knife.
- Aluminum construction
- Weighs 2.08 ounces
- Small size classification
- Yellow finish for visibility
Who it's for
Works for anyone wanting a compact, sturdy cutter for boxes, tape and packaging around the home or office. Not intended as a heavy construction or trade knife.
Strengths and trade-offs
Drawn from this product's published specifications.
- Aluminum body adds durability over plastic
- Small, light size for easy carry
- Small size limits it to lighter cutting jobs
Performance notes
At 2.08 ounces with an aluminum body, the knife balances durability against the lighter weight of plastic-bodied cutters. Its small size classification keeps it easy to handle and store but limits it to lighter cutting tasks.
Specifications
| Brand | BIIB |
|---|---|
| Model | BI-91-Yellow |
| Material | Aluminum |
| Item Weight | 2.1 ounces |
| Size | Small |
Other BIIB knifes
How it compares
This product against the closest alternatives we track in knifes.
| Product | Amazon rating | Ratings | ProductDome score |
|---|---|---|---|
| BIIB BI-91-Yellow KnifeThis product | 4.5 / 5 | 7,400 | 4.5 / 5 |
| WORKPRO W013053AU KnifeWORKPRO | 4.8 / 5 | 9,700 | 4.7 / 5 |
| Victorinox 0.6223.G KnifeVictorinox | 4.8 / 5 | 9,400 | 4.7 / 5 |
| LEATHERMAN 831426 KnifeLEATHERMAN | 4.8 / 5 | 9,800 | 4.6 / 5 |
| Gerber 31-000345 KnifeGerber | 4.7 / 5 | 16,300 | 4.6 / 5 |
Similar knifes from other brands
Questions about the BIIB BI-91-Yellow
Common buyer questions answered straight from the product spec data - no fluff, no "it depends".
What is the BIIB BI-91-Yellow made of?
It has an aluminum body.
How much does the BIIB BI-91-Yellow weigh?
It weighs 2.08 ounces.
What size is the BIIB BI-91-Yellow?
It is listed as a small size cutter.