Baggage on a plane

[ravishon]

3 of us are flying from London to Amsterdam on Friday and we are taking backpacks, the type shown on this site and like those you would take camping or hiking.

I just heard that apparently you cant check in bags like that because they have too many loose straps and things like that...is this true, and if it is, what can i do about it.

we cant go backpacking with a suitcase.

thanks