Travelling with gear

Heading out to Newfoundland next week with a body and 400 lense, one 50mm lense and was wonder about the best way to take this with me. The measurements on Westjet for carry one baggage is (21 in. x 9 in. x 15 in.) , personal item is (16 in. x 6 in. x 13 in.). Weird why their is different sizes, as both end up being carried on. My current camera bag is larger than this so checking it in instead of carry on is not something I would like to do. Any tips on how to may sure it comes with me on the plan, no issues with buying a different case. Thanks.

I would call the airline to get their specifications. I know the 400 is long and may not fit in the length restriction. Doesn't hurt to ask. Good luck!

Contacted Westjet, waiting for them to let me know. Have a great weekend.

Not sure if the Pelican 1510 will work with your 400mm, but it can be locked and gate-checked before you get on the plane and then you can grab it right as you get off.

I suspect one size is for the overhead locker, the other for under the seat in front.