I'm crew and I'm back in my own bed more or less every night. However, in my case I have a change of civvies, a change of shirt and toiletries. The toiletries see me through some long days and some Unscheduled nightstops. Also in my crew bag is my 'plonky kit' which contains things such as oven gloves, calculator, ice tongs, sewing kit. All of which has to be carried as a minimum.
As a senior I also have a folder of paperwork, something which some juniors also carry. Put all that into a bag and you soon have a near full crew bag.
At my previous airline I didn't have any problems checking in my crew bag. When it comes to crew, with crew bags onboard, they need what's on those bags for the flight. That is why generally long haul crew have their case plus their trolley bag.