Zoogirl, adthedad , is quite right that the leg bag can cause irritation, especially in the warmer weather and changing legs each day is a good idea.
Another option is as follows. I had a shower every day and you Will need an extra thigh strap. I assume you have been told that you only disconnect the leg bag from the catheter after 5-7 days, this is inline with infection control.
If showering in the morning, disconnect the night bag from the leg bag and depending on what you have been given drain it and thow the night bag away. I was given two leg bags and 14 night bags. Make sure the leg bag is empty and securly attached to the catheter. Make sure the catheter is secured to the thigh strap. Remove the bag straps let it hang down and shower, dry off and put the spare thigh strap on the other leg, transfer the catheter and bag to the dry strap and refit the leg bag straps. Remove the wet strap and dry for the next day. If the leg bag has a fabric backing just pat it to soak up any moisture.
I have also used a soft dry wipe under the part of the strap that is causing the leg to get sore.
I use the adhesive catheter fixation device and a leg sleeve, with a short tube leg bag. Unfortunately you get what the hospital has, not necessarily what is best.
Thanks Chris