Temporary side bags

[Sea-Strom]

Don't carry stuff often but liked the look of these throw over bags with a hard outer shell.
Bit of a fiddle to fit first time but leaving the ties in place should be simple to take on and off. Two large Kevlar hoodies in each one on bike. Each bag will expand to twice the size with a zip opening. Room for a large holdall on top of back seat as well so with top box and fully expanded side boxes some impressive volume here! Thought it enough to pay for my rare fully loaded trips. Liked the look compared to all-canvas throw over bags.
https://www.ebay.co.uk/itm/283729568560

[porter]

I use soft panniers on my strom also, does for the one trip a year I do.
I use supports to level out the panniers and keep them from the wheel,  mine are home made but several firms make them, Cosmo, Shad to name two.
Don't believe they're waterproof, mine weren't even with the covers on! Not nice to ride 200 miles in the rain and find all your clothes soaking wet.

[Gert]

Could one not use a hiking boot brand of a waterproof spray to slow down dampness from getting into the panniers?  Also place the pannier contents in garbage bags as an added water protection.
Also check that if water should get into the pannier, the water is able to drain away and not to pool in the base of the pannier.

[Sea-Strom]

Yes I think binbags for fabric etc is a good idea. Or don't ride in the rain! But I suppose you can get caught out even with good forecasts.