I just traveled to Norway with the same concerns and issues...

I used a large Pelican case and everything packed well and safe. I did use wire ties (over TSA locks) and a second set was taped inside the case (different color) with instructions to replace. Wire ties are important to keep the latches tight...spillage would be very bad.

I found you can "declare" excess value (only on dedicated hard cases like the Pelican) that will give coverage up to the declared value.
Check with your air line and insist because it is available. $5k in coverage was about $100

You need fill out the TSA form from on line ahead of time with serial numbers and values of each item and make copies.

Be sure the airport you fly from has the "excess value" forms to fill in for a declaration on the case.

My check in took nearly 3 hours when it was discovered after 10 calls that they did not have the needed form on hand. They had no way of charging me a fee.

So...I sent the Pelican off without the extra declared valuation, but felt fairly safe after talking with the airline management.

I was told it is an option worth the effort but so few ask for it they did not have any form on hand. They actually learned something from my inquiry.

So in conclusion... 1. use a Pelican case 2. fill out the TSA form with serial numbers and value (copy enclosed) 3. Inquire prior to the trip to your airline for the "excess value form" so you can be charged 4. buy the airline travel insurance when you purchase the ticket (worth it and adds $1000 to the case or luggage) 5. relax.

I got the bag at arrival in Norway in perfect condition with a TSA slip neatly filled in and put inside the case...the other blue wire ties were installed nicly with everything packed as I had it... life is good.

P.S. I did find that TSA locks are considered a joke outside the US and are usually cut off and thrown in the bag. Be sure to buy good quality colored wire ties instead... Also be ready to catch your bag as it comes off the carousel to avoid the 2 foot drop at some air ports (optional)...

Cheers