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Figuring out Sizing for new backpacks

  
 
Graham_216
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p.1 #1Figuring out Sizing for new backpacks
I've been needing a new camera bag for a bit now. I have a Sony 200-600, so I need something that can comfortably fit that 28-70, 70-200, two camera bodies with battery grips, plus accessories and a laptop. I was thinking of going with the Thinktank Photo Darklight backpack (20L). Does anyone have a good experience with any other backpacks or any advice on how to pick one out?

Here's the link to the backpack: https://www.bhphotovideo.com/c/product/1863946-REG/think_tank_photo_720504_darklight_backpack_montane_green.html
Oct 29, 2026 at 01:09 PM
Jeffrey
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p.1 #2Figuring out Sizing for new backpacks
That's a good kit. You might be better with the next size up as you will surely want to pack in some batteries, filters, a packable raincoat. and some snacks.
Oct 29, 2026 at 01:56 PM
Jack Flesher
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p.1 #3Figuring out Sizing for new backpacks
The 20L Darklight will just hold that kit BUT it's just a tad thin and with VG's on the bodies, one body would probably need to be naked, no lens attached; and everything else pretty tight. I think the 25L is going to be a better choice, leaving a bit of wiggle room.
Oct 29, 2026 at 02:03 PM
ruthenium
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p.1 #4Figuring out Sizing for new backpacks
An additional consideration is air travel. The size and weight restrictions on what one can take as a personal item or carry-on can vary depending on where you may want to travel with your gear (if flying is in your plans).
Oct 29, 2026 at 02:11 PM
Jack Flesher
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p.1 #5Figuring out Sizing for new backpacks
Note: the other really nice feature of the Darklights are side compression straps that allow snugging up. The unused free or looser space.
Oct 29, 2026 at 02:57 PM
Craig Gillette
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p.1 #6Figuring out Sizing for new backpacks
You might want to look at some panel loading backpacks and travel packs. That could mean adapting inserts to fit. I have an REI Ruckpack (if I remember the name correctly) that easily handles the 200-600. I have the tall size but with the internal frame, might be a bit large for some carry-on limits.
Oct 29, 2026 at 03:02 PM
 


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chez
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p.1 #7Figuring out Sizing for new backpacks
I personally would go to a store and load up your gear and try it out to see how comfortable the loaded pack is on you. If you just want the pack for transport, that’s a different story, but if you are going to carry that load for any length of time, I’d want to try putting the loaded pack on for a bit. Specs don’t tell you how the pack fits your body.
Oct 29, 2026 at 03:14 PM
EB-1
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p.1 #8Figuring out Sizing for new backpacks
I also think that 20L is rather tight for working out of, especially with the 5" depth. It might be OK for transport only. I prefer bags with 6" depth.
I use a 26L backpack for the Sony 200-600, Canon 100-500, 24-105/4, 1.4x, two cameras, 5 batteries, memory cards, 3 glasses, LensCoats, small power supply, and other stuff.

EBH
Oct 29, 2026 at 03:18 PM
ruthenium
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p.1 #9Figuring out Sizing for new backpacks
This is the backpack that I am using - I don't mean this as an endorsement, but I haven't had problems when flying with this backpack as a "personal item" (not a carry-on), e.g., on a recent AirCanada flight to Grenada.

The question is what is the main purpose? There are backpacks for hiking, also some that allow easy access to the gear. In my use, the backpack is mostly for transporting the gear when flying, or travelling by train outside of Canada. One of my considerations was the weight of the backpack itself, that I wanted to be as light as possible.




Oct 29, 2026 at 03:31 PM
bwcolor
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p.1 #10Figuring out Sizing for new backpacks


Graham_216 wrote:
I've been needing a new camera bag for a bit now. I have a Sony 200-600, so I need something that can comfortably fit that 28-70, 70-200, two camera bodies with battery grips, plus accessories and a laptop. I was thinking of going with the Thinktank Photo Darklight backpack (20L). Does anyone have a good experience with any other backpacks or any advice on how to pick one out?

Here's the link to the backpack: https://www.bhphotovideo.com/c/product/1863946-REG/think_tank_photo_720504_darklight_backpack_montane_green.html

That backpack seems a good bit on the small size. I agree with trying in person, or call B&H. Their sales people can be quite helpful.
Oct 29, 2026 at 04:26 PM
Craig Gillette
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p.1 #11Figuring out Sizing for new backpacks


chez wrote:
I personally would go to a store and load up your gear and try it out to see how comfortable the loaded pack is on you. If you just want the pack for transport, that’s a different story, but if you are going to carry that load for any length of time, I’d want to try putting the loaded pack on for a bit. Specs don’t tell you how the pack fits your body.


This! I'm long waisted and like a taller fit pack if dealing with more than a little weight. Trying it on loaded is really helpful. And gets you a look at materials and quality.
Oct 29, 2026 at 04:36 PM


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