I have to agree with Pete on this one, I’m not a fan of sacking, I don’t own any sacks, I’ve a retainer sling that I will place the carp in for a few minutes after the fight so it can get its breath back and I can sort the camera equipment out. I much rather prefer to master self takes rather than retain carp for an extended length of time. Even with smart phones these days, self takes are possible. I use a little phone holder to hold it steady, then take a few practice shots so I can get my markers sorted, I look at the background of the practice shot so I know what to use, if a branch is at the top of the practice shot, then I make sure my head is not above that branch, or it will cut off my head in the photo, if that makes sense!! You can always edit the pics on phones afterward to adjust it to your liking. All these pics below are smart phone self takes, the hardest thing I find is trying not to pull a stupid face!