Lol yeah, 10kg is a lot of weight! Yes, thanks, from what you said it seems the 7L will be big enough.
You said you're upgrading to the magnetic clip. I just called Photospecialist and got put through to the Netherlands. He said he didn't know about the Fidlock magnetic clip nor is it mentioned on their website, but he would find out and email me.
Also, they're temporarily out of stock of both sizes (I just noticed it on their pages) and he will let me know in a couple of days when new stock is due in. Did you order yours before it went out of stock? And have you ordered the Fidlock clip directly from Wotancraft in the US?
I had looked at ordering from them but havent ordered yet. I think it was the main manufacturers website where I had seen the £134 price with the clip. On looking last night I couldn't see many options on photospecialist so I have specced up a bag on the main website in tw. Prices are the same is you assume you will be hit for 20% VAT when it arrives anyway. Only delay is the 18 days shipping time (or 9 days if you for fast shipping)
So far I have added the magnetic strap and the two clip on pouches which are on special offer if you buy two on their website - $25 each as opposed to the normal $40 each if buying single. Plus the filter/lens cap/coin zipper bag.
£18 each (plus vat potentially) seems a good deal for option pouches.
Total price now is $232 so £170 (plus VAT potentially).
Last two things i got from TW came with no vat to pay though so I may get lucky. I got my thinktank 7 from there directly as well. Came quicker then they stated as well.