Appears to be strong and durable. But a tip for fitting (because I didn't see the instructions, or maybe I just mixed it up): separate the soft cover from the inner hard plastic, detach the top hard plastic from the bottom hard plastic, fix the phone between two hard plastic elements and cover it again with the soft cover off.
Rechargeable 12V 3000MAh Lithium Battery Pack: Power Bank For LED Strip, CCTV Camera & More
43 Review
NinjaBatt High Performance Battery For Toshiba A665 And L755 Series - 6 Cells/4400MAh/48Wh
40 Review
Keyboard Cover For HP Pavilion X360 14 14-Dk 14M-Dh 14-Dq/Dh 14-Fq 14-Ce/Cf 14T-Dh200 14-Dq0070Nr 14-Fq1025Nr 14-Dq0011Dx/Dq0004Dx/Dq0002 14-Dh2011Nr Fq1097Nr 14T-Dq300 14Z-Fq000 14-Cb185Nr, GPink
39 Review
2 Pack EN-EL19 Battery & Rapid USB Charger For Nikon Coolpix S32-S7000 Cameras - OAproda
41 Review