No problems ssaj!
I'd say the device alone is sufficient.
Shower strap might be nice, but I never had it and never felt a need for it. I just sat down on a bench in the shower and relaxed. A daily "meditation" session in politically correct terms.
Lubes are readily available and tastes vary. The bag might be neat for storage, but seems sili in a way, unless you travel a lot and carry the unit with you. Towels, again, cheap and readily available from your local market. A nice stiffier (as in heavy) hand towel will replace the cleaning brush in a way.
And USB stick? Come on ... I have more than enough already. Simply pretty useless jibbajabba-utensils.
I used mine in the shower, for 20 - 30 minutes at times. Nowadays I use the
Penomet. I recommend the 5x5 sets, as in five minutes of pumping with the
Bathmate and then jelqing. This way you should gain more tissue expansion than fluid retention. You can go longer times in the tube though, but the risk of fluid retention grows. Some fluid retention isn't so bad, but excessive isn't good.
I found it to be pretty comfortable using the unit without the
shower strap. I don't have a bathtub. I just take a shower bench, sit down and pump away. The strap would be great for if you want to wash your body at the same time, but I feel that when you sit down and relax, the blood flow to your penis will be better than doing something extra at the same time.
All the best to you! Happy growing!