View attachment 680754
£19.99
https://www.ebay.co.uk/itm/175496123985?_trkparms=amclksrc=ITM&aid=1110006&algo=HOMESPLICE.SIM&ao=1&asc=245820&meid=9cc6858819d64955b030780bbf1aca9b&pid=101195&rk=4&rkt=12&sd=266001600325&itm=175496123985&pmt=1&noa=0&pg=2047675&algv=SimplAMLv11WebTrimmedV3MskuWithRevOptLambda85KnnRecallV1AndV6ItemNrtInQueryAndCassiniVisualRanker&_trksid=p2047675.c101195.m1851&amdata=cksum:1754961239859cc6858819d64955b030780bbf1aca9b|enc:AQAHAAABUPc3I89H0AQHQHV%2FOlsMl254OIifOGpM%2BBEVlem%2B%2B9zqkiF5v06l0lZvmgOKI85oqIQoVeqzX5anW3c2z8VQG1s2EXcLUko1slSTch6KegK80F7vxNzjrgLeB2hzasxLLHgMjPeLrgzYBeDuxDQ9cgIej7yHuGbSRP%2FlWnlZBRD73SL07NqewOPM5YgRyjL3pBRLihdpmj6Nq1gfJKS29km9pGaLV0nFAUQN2X7wBfrhxAyBm7xe%2FbWXs9BNxAm9vBgR2vzAfvGO%2Bhdsvyhlf6DY4q1cqoiaSLyLDpli6yF1PT9WJqTGn%2BH61l7ZYtnJHODItnL2diT1PKwh5%2BsH%2FkdU%2B2emQPAouW6BPNfhQfBEMN1PFqsPy0QP0PoIIqoiVVqK9f%2BDWsFzf6OVboi%2BWDa%2F3rTWWW8AQ615kBRJSPlxA0VbndXL7K31JW5sZOHJiw%3D%3D|ampid:PL_CLK|clp:2047675
So, a bag update:

Sorry, the stupid computer won't load the image the correct way round but... I am really impressed with the quality. It is made of a thick material and it is insulated. The webbing on the front is well stitched and the it clips to the bike securely.
The shoulder strap is cheap but for me that doesn't really matter, I won't be using it. You get a shower cap too - I think it is to go over the bag, not for the shower. Looking at the bag though I am not sure you would need it in anything other than a massive downpour.
So I think it was £23... I'd say it's a bargain. On first use I think it will last ME the year, for the 6-10 times I will use it. It probably will last me longer... but even if it falls apart after that year I won't be bothered at all.
Thank you for the link again @Kell, it was a great spot.