Below are reviews for these primary "100mm" professional options. Canon EF 100-400mm f/4.5-5.6L IS II USM Lens
If your "large 100" refers to carrying a 100-400mm lens or heavy gear, this backpack is often the top recommendation. image_large_100
Customizable with various "Core Unit" inserts to protect specific gear. Community Feedback Below are reviews for these primary "100mm" professional