Bike Packing Seat Bag advice

[dodgyviper]

Am doing the C2C next year along with a couple of overnight stays as part of training - and general getting out and about.

The variety of seat packs is a bit mind boggling, so am hoping to delve into the real world experience of any PHers.

What bags have you loved and hated?

Have looked at holster types - Restrap, Terrapin, Blackpool, Porcelain Rocket etc

Also all-in-ones, Ortlieb, Altura, Apidura.

The list could go on for a long time.

What has given you the least tail wag?
Have any of them caught on your legs?
Waterproof seams vs Dry bags?

Is it sensible to go for a large and just squash it down for when you don't need all of the space? Or are there hidden pitfalls in doing this?

Has anyone tried the bag stabilizers from Woho? I like the ability of putting a couple of bottles on them as well as steadying the bag.

[dodgyviper]

Thanks for the input folks

A few holster replies which is interesting. I do like the idea of whipping the dry bag out with zero faff.

The Big Papa wouldn't be too much of a problem width wise as I tend to have the seat forward a bit more than the norm - 1/2-3/4 inches

I will be travelling relatively light, going for the 2 day transit, so stopping at Whitehaven and Alston - my folks live in Tynemouth, so they can hose me down when I get in

couple of t-shirts
Light walking trousers
Jersey
undies and socks
toiletries

Waterproofs I'd tie to the top of the bag .
Have a small frame/stem bag for tools/phone/tube/CO2 etc
Someone else is taking a handpump

The only thing I haven't got apart from the bag is Celtic Dragons T-shirt - I think that may be essential above all else. (PS thanks for the detailed reply Celtic Dragon)