@Harper IMG and Seven Corners are both great choices for long trips, but they differ in some ways.
IMG offers high coverage limits and allows you to pay monthly, which is quite nice. They even have plans for adventure riders, so if you're planning to dive or go parachuting, you’re covered.
On the other hand, Seven Corners also covers adventure sports but works with fixed payouts. Just make sure those payouts will cover what you need for any services you might use.
When it comes to claims, reviews for both companies are a bit of a mixed bag. So, definitely take a moment to read the fine print, especially regarding the sports you're into, before making a decision.