Lowepro Flipside 400 vs Think Tank Streetwalker Pro

I have the Flipside 300 and the Streetwalker Pro HD, and while I like both of these, I'm in need of something in between them in side. I've been trying to shoehorn stuff into the Flipside 300 when the Streetwalker Pro HD is overkill, and I've been looking at the Flipside 400 and regular Streetwalker Pro. Anyone ever done a side-by-side of these two backpacks? It *looks* like either would fit the bill for me, based on pictures I've seen of gear inside. Pros and cons of each? Thanks.

i have a flipside 400 have had it for almost a year now but it will hold a lot more than what i have in it. a couple of months ago it held a 5dc, 5dmkii,35L,85L, 135L,50 i.4, 580exii x2, and soem filters for strobist work and still had more room

The base kit I'm planning to drag around in this bag would be a 1DX with 70-200 f2.8 attached with hood (reversed), 24-70 or 16-35 w/hoods, 1.4x and 2x extenders, 50L or 85L, and 580EX II...along with some odds and ends. It's really, really tight in the Flipside 300. So just a little bit bigger without going overboard is what I'm looking for. I haven't compared the physical size of the Flipside 400 with the Think Tank Streetwalker Pro. I'm wondering how they compare with size and weight. I think both will easily accommodate what I want to carry in them, but I'm less sure about the Streetwalker Pro in that regard. It looks a little smaller inside.

I have a 300 too. And am also thinking of moveing to a 400. Im interested in your thoughts on this as we decide.

If my phone will post the picture to flickr, i will post it here but its almost dead and not working really

ok this is how it looks with a gripped 5d with 35L and hood on attached with a 85Lmkii in front of that with a 50mm f/.4 to the side of that on the far side there is a rocket blower extra batts. and a cybercommander. you can see that there is loads of extra room

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It does look like the Flipside 400 has more room than the Streetwalker Pro. It's also a fair amount cheaper. I do like the slim form factor of the Streetwalker, but I'm not sure it's much bigger than my Flipside 300. The external dimensions indicate the Flipside is bigger, but the internal dimensions (from the specs I read online) are very similar. Weight is also very similar. The Flipside might make more sense, but I'm still debating it.

Last year I tried a Streetwalker HD fully loaded with my gear. For me, the slim factor of the Streetwalker HD was very uncomfortable. The straps were not wide enough. All of the weight felt like it was on my spine. The standard backpack width of the Lowepro Flipside 400 is very comfortable and has more inside storage.
Since I have the Lowepro Flipside 400 AW, I highly recommend.

Get the Flipside 400AW. The back access is always good and it has better padding.

Since your going to be carrying quite a bit of kit, I think most of the weight of the pack will be on the hips, so the better padded waistband of the Flipside 400 would be better

I think you all convinced me that the Flipside 400 is the better option, and I placed the order. Thanks.

I had the Flipside for a week and took it back to the store. It's a really nice camera backpack and I will probably be picking another one up as it does just about everything I need to have a bag do. The reason I returned the bag was it was bigger than my Canon EG200 backpack and didn't hold quite as much gear. The Flipside doesn't have as many outside pockets as the EG200 and the pockets do allow for a lot more gear (un-needed stuff). The Flipside was a whole lot more comfortable to carry with both the shoulder straps and a great waist band being a big improvement over the EG 200. Also the Flipside has much better padding to protect the gear inside and since I may be doing a lot of overseas travel soon the extra padding (Flipside's padding not mine) will be worth the little extra size in the camera bag.

I had a Flipside 300, and recently upgraded to 400. The 400 holds all my gear that I listed below with ease. I'm very satisfied with the 400.

sdi, i think someone mentioned that the 24-70 m1 hood is compatible with some of the 70-2002.8s? That would save you some space right there.

SD, Flipside 400 fits gripped body w/70-200 II mounted with 2x tc and hood on ready to shoot.